diff --git a/app/Console/Commands/UpdateSolrDataset.php b/app/Console/Commands/UpdateSolrDataset.php
new file mode 100644
index 0000000..e5fb097
--- /dev/null
+++ b/app/Console/Commands/UpdateSolrDataset.php
@@ -0,0 +1,55 @@
+<?php
+
+namespace App\Console\Commands;
+
+use Illuminate\Console\Command;
+use App\Models\Dataset;
+use App\Library\Search\SolariumAdapter;
+use \Exception;
+
+class UpdateSolrDataset extends Command
+{
+    /**
+     * The name and signature of the console command.
+     *
+     * @var string
+     */
+    protected $signature = 'update:dataset {dataset : The ID of the dataset}';
+
+    /**
+     * The console command description.
+     *
+     * @var string
+     */
+    protected $description = 'Update solr dataset with given ID';
+
+    /**
+     * Create a new command instance.
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        parent::__construct();
+    }
+
+    /**
+     * Execute the console command.
+     *
+     * @return mixed
+     */
+    public function handle()
+    {
+        $datasetId = $this->argument('dataset');
+        $dataset = Dataset::find($datasetId);
+        // $this->info($dataset->authors->implode('full_name', ', '));
+
+        try {
+            // Opus_Search_Service::selectIndexingService('onDocumentChange')
+            $service = new SolariumAdapter("solr", config('solarium'));
+            $service->addDatasetsToIndex($dataset);
+        } catch (Exception $e) {
+            $this->error(__METHOD__ . ': ' . 'Indexing document ' . $dataset->id . ' failed: ' . $e->getMessage());
+        }
+    }
+}
diff --git a/app/Console/Kernel.php b/app/Console/Kernel.php
index bcdf533..2e482ee 100755
--- a/app/Console/Kernel.php
+++ b/app/Console/Kernel.php
@@ -15,7 +15,8 @@ class Kernel extends ConsoleKernel
         'App\Console\Commands\Inspire',
         'App\Console\Commands\DatasetState',
         'App\Console\Commands\SolrIndexBuilder',
-        'App\Console\Commands\Log\ClearLogFile'
+        'App\Console\Commands\Log\ClearLogFile',
+        'App\Console\Commands\UpdateSolrDataset'
     ];
 
     /**
diff --git a/app/Library/Search/SolariumAdapter.php b/app/Library/Search/SolariumAdapter.php
index 1066715..5287cbe 100644
--- a/app/Library/Search/SolariumAdapter.php
+++ b/app/Library/Search/SolariumAdapter.php
@@ -95,7 +95,7 @@ class SolariumAdapter
 
         foreach ($documents as $document) {
             if (!($document instanceof Dataset)) {
-                throw new InvalidArgumentException("invalid dataset in provided set");
+                throw new \InvalidArgumentException("invalid dataset in provided set");
             }
         }
 
diff --git a/app/Library/Xml/DatasetExtension.php b/app/Library/Xml/DatasetExtension.php
index db9f238..39ef043 100644
--- a/app/Library/Xml/DatasetExtension.php
+++ b/app/Library/Xml/DatasetExtension.php
@@ -50,7 +50,7 @@ trait DatasetExtension
         'PersonAuthor' => array(
             'model' => Person::class,
             'through' => 'link_documents_persons',
-            'pivot' => array('role' => 'author'),
+            'pivot' => array('role' => 'author', 'sort_order' => 'sort_order'),
                             //'sort_order' => array('sort_order' => 'ASC'),   // <-- We need a sorted authors list.
             //'sort_field' => 'SortOrder',
             'relation' => 'persons',
@@ -59,7 +59,7 @@ trait DatasetExtension
         'PersonContributor' => array(
             'model' => Person::class,
             'through' => 'link_documents_persons',
-            'pivot' => array('role' => 'contributor', 'contributor_type' => 'contributor_type'),
+            'pivot' => array('role' => 'contributor', 'contributor_type' => 'contributor_type',  'sort_order' => 'sort_order'),
             //                'sort_order' => array('sort_order' => 'ASC'),   // <-- We need a sorted authors list.
             //'sort_field' => 'SortOrder',
             'relation' => 'persons',
diff --git a/app/Listeners/DatasetUpdated.php b/app/Listeners/DatasetUpdated.php
index 4b7f58e..e45943d 100644
--- a/app/Listeners/DatasetUpdated.php
+++ b/app/Listeners/DatasetUpdated.php
@@ -60,7 +60,7 @@ class DatasetUpdated
             $service = new SolariumAdapter("solr", config('solarium'));
             $service->addDatasetsToIndex($dataset);
         } catch (Opus_Search_Exception $e) {
-            Log::debug(__METHOD__ . ': ' . 'Indexing document ' . $documentId . ' failed: ' . $e->getMessage());
+            Log::debug(__METHOD__ . ': ' . 'Indexing document ' . $dataset->id . ' failed: ' . $e->getMessage());
         } catch (InvalidArgumentException $e) {
             Log::warning(__METHOD__ . ': ' . $e->getMessage());
         }
diff --git a/composer.lock b/composer.lock
index 75ed9b8..74b7be2 100755
--- a/composer.lock
+++ b/composer.lock
@@ -451,16 +451,16 @@
         },
         {
             "name": "egulias/email-validator",
-            "version": "2.1.21",
+            "version": "2.1.22",
             "source": {
                 "type": "git",
                 "url": "https://github.com/egulias/EmailValidator.git",
-                "reference": "563d0cdde5d862235ffe24a158497f4d490191b5"
+                "reference": "68e418ec08fbfc6f58f6fd2eea70ca8efc8cc7d5"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/egulias/EmailValidator/zipball/563d0cdde5d862235ffe24a158497f4d490191b5",
-                "reference": "563d0cdde5d862235ffe24a158497f4d490191b5",
+                "url": "https://api.github.com/repos/egulias/EmailValidator/zipball/68e418ec08fbfc6f58f6fd2eea70ca8efc8cc7d5",
+                "reference": "68e418ec08fbfc6f58f6fd2eea70ca8efc8cc7d5",
                 "shasum": ""
             },
             "require": {
@@ -505,7 +505,7 @@
                 "validation",
                 "validator"
             ],
-            "time": "2020-09-19T14:37:56+00:00"
+            "time": "2020-09-26T15:48:38+00:00"
         },
         {
             "name": "facade/ignition-contracts",
@@ -1213,16 +1213,16 @@
         },
         {
             "name": "league/mime-type-detection",
-            "version": "1.4.0",
+            "version": "1.5.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/thephpleague/mime-type-detection.git",
-                "reference": "fda190b62b962d96a069fcc414d781db66d65b69"
+                "reference": "ea2fbfc988bade315acd5967e6d02274086d0f28"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/thephpleague/mime-type-detection/zipball/fda190b62b962d96a069fcc414d781db66d65b69",
-                "reference": "fda190b62b962d96a069fcc414d781db66d65b69",
+                "url": "https://api.github.com/repos/thephpleague/mime-type-detection/zipball/ea2fbfc988bade315acd5967e6d02274086d0f28",
+                "reference": "ea2fbfc988bade315acd5967e6d02274086d0f28",
                 "shasum": ""
             },
             "require": {
@@ -1260,7 +1260,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-08-09T10:34:01+00:00"
+            "time": "2020-09-21T18:10:53+00:00"
         },
         {
             "name": "mcamara/laravel-localization",
@@ -1427,16 +1427,16 @@
         },
         {
             "name": "nesbot/carbon",
-            "version": "2.40.0",
+            "version": "2.40.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/briannesbitt/Carbon.git",
-                "reference": "6c7646154181013ecd55e80c201b9fd873c6ee5d"
+                "reference": "d9a76d8b7eb0f97cf3a82529393245212f40ba3b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/briannesbitt/Carbon/zipball/6c7646154181013ecd55e80c201b9fd873c6ee5d",
-                "reference": "6c7646154181013ecd55e80c201b9fd873c6ee5d",
+                "url": "https://api.github.com/repos/briannesbitt/Carbon/zipball/d9a76d8b7eb0f97cf3a82529393245212f40ba3b",
+                "reference": "d9a76d8b7eb0f97cf3a82529393245212f40ba3b",
                 "shasum": ""
             },
             "require": {
@@ -1512,20 +1512,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-09-11T19:00:58+00:00"
+            "time": "2020-09-23T08:17:37+00:00"
         },
         {
             "name": "nikic/php-parser",
-            "version": "v4.10.0",
+            "version": "v4.10.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/nikic/PHP-Parser.git",
-                "reference": "1c13d05035deff45f1230ca68bd7d74d621762d9"
+                "reference": "658f1be311a230e0907f5dfe0213742aff0596de"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/1c13d05035deff45f1230ca68bd7d74d621762d9",
-                "reference": "1c13d05035deff45f1230ca68bd7d74d621762d9",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/658f1be311a230e0907f5dfe0213742aff0596de",
+                "reference": "658f1be311a230e0907f5dfe0213742aff0596de",
                 "shasum": ""
             },
             "require": {
@@ -1564,7 +1564,7 @@
                 "parser",
                 "php"
             ],
-            "time": "2020-09-19T14:52:48+00:00"
+            "time": "2020-09-26T10:30:38+00:00"
         },
         {
             "name": "opis/closure",
@@ -2162,16 +2162,16 @@
         },
         {
             "name": "symfony/console",
-            "version": "v4.4.13",
+            "version": "v4.4.14",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/console.git",
-                "reference": "b39fd99b9297b67fb7633b7d8083957a97e1e727"
+                "reference": "90933b39c7b312fc3ceaa1ddeac7eb48cb953124"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/console/zipball/b39fd99b9297b67fb7633b7d8083957a97e1e727",
-                "reference": "b39fd99b9297b67fb7633b7d8083957a97e1e727",
+                "url": "https://api.github.com/repos/symfony/console/zipball/90933b39c7b312fc3ceaa1ddeac7eb48cb953124",
+                "reference": "90933b39c7b312fc3ceaa1ddeac7eb48cb953124",
                 "shasum": ""
             },
             "require": {
@@ -2249,11 +2249,11 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-09-02T07:07:21+00:00"
+            "time": "2020-09-15T07:58:55+00:00"
         },
         {
             "name": "symfony/css-selector",
-            "version": "v5.1.5",
+            "version": "v5.1.6",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/css-selector.git",
@@ -2320,16 +2320,16 @@
         },
         {
             "name": "symfony/debug",
-            "version": "v4.4.13",
+            "version": "v4.4.14",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/debug.git",
-                "reference": "aeb73aca16a8f1fe958230fe44e6cf4c84cbb85e"
+                "reference": "726b85e69342e767d60e3853b98559a68ff74183"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/debug/zipball/aeb73aca16a8f1fe958230fe44e6cf4c84cbb85e",
-                "reference": "aeb73aca16a8f1fe958230fe44e6cf4c84cbb85e",
+                "url": "https://api.github.com/repos/symfony/debug/zipball/726b85e69342e767d60e3853b98559a68ff74183",
+                "reference": "726b85e69342e767d60e3853b98559a68ff74183",
                 "shasum": ""
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             "require": {
@@ -2387,20 +2387,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-08-10T07:47:39+00:00"
+            "time": "2020-09-09T05:20:36+00:00"
         },
         {
             "name": "symfony/error-handler",
-            "version": "v4.4.13",
+            "version": "v4.4.14",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/error-handler.git",
-                "reference": "2434fb32851f252e4f27691eee0b77c16198db62"
+                "reference": "5a6feca7a384015a09e14265c35ee0bd6f54b2ed"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/error-handler/zipball/2434fb32851f252e4f27691eee0b77c16198db62",
-                "reference": "2434fb32851f252e4f27691eee0b77c16198db62",
+                "url": "https://api.github.com/repos/symfony/error-handler/zipball/5a6feca7a384015a09e14265c35ee0bd6f54b2ed",
+                "reference": "5a6feca7a384015a09e14265c35ee0bd6f54b2ed",
                 "shasum": ""
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             "require": {
@@ -2458,20 +2458,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-08-17T09:56:45+00:00"
+            "time": "2020-09-25T08:51:35+00:00"
         },
         {
             "name": "symfony/event-dispatcher",
-            "version": "v4.4.13",
+            "version": "v4.4.14",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/event-dispatcher.git",
-                "reference": "3e8ea5ccddd00556b86d69d42f99f1061a704030"
+                "reference": "e17bb5e0663dc725f7cdcafc932132735b4725cd"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/event-dispatcher/zipball/3e8ea5ccddd00556b86d69d42f99f1061a704030",
-                "reference": "3e8ea5ccddd00556b86d69d42f99f1061a704030",
+                "url": "https://api.github.com/repos/symfony/event-dispatcher/zipball/e17bb5e0663dc725f7cdcafc932132735b4725cd",
+                "reference": "e17bb5e0663dc725f7cdcafc932132735b4725cd",
                 "shasum": ""
             },
             "require": {
@@ -2489,6 +2489,7 @@
                 "psr/log": "~1.0",
                 "symfony/config": "^3.4|^4.0|^5.0",
                 "symfony/dependency-injection": "^3.4|^4.0|^5.0",
+                "symfony/error-handler": "~3.4|~4.4",
                 "symfony/expression-language": "^3.4|^4.0|^5.0",
                 "symfony/http-foundation": "^3.4|^4.0|^5.0",
                 "symfony/service-contracts": "^1.1|^2",
@@ -2542,7 +2543,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-08-13T14:18:44+00:00"
+            "time": "2020-09-18T14:07:46+00:00"
         },
         {
             "name": "symfony/event-dispatcher-contracts",
@@ -2622,16 +2623,16 @@
         },
         {
             "name": "symfony/finder",
-            "version": "v4.4.13",
+            "version": "v4.4.14",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/finder.git",
-                "reference": "2a78590b2c7e3de5c429628457c47541c58db9c7"
+                "reference": "5ef0f6c609c1a36f723880dfe78301199bc96868"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/finder/zipball/2a78590b2c7e3de5c429628457c47541c58db9c7",
-                "reference": "2a78590b2c7e3de5c429628457c47541c58db9c7",
+                "url": "https://api.github.com/repos/symfony/finder/zipball/5ef0f6c609c1a36f723880dfe78301199bc96868",
+                "reference": "5ef0f6c609c1a36f723880dfe78301199bc96868",
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@@ -2681,20 +2682,95 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-08-17T09:56:45+00:00"
+            "time": "2020-09-02T16:08:58+00:00"
         },
         {
-            "name": "symfony/http-foundation",
-            "version": "v4.4.13",
+            "name": "symfony/http-client-contracts",
+            "version": "v2.2.0",
             "source": {
                 "type": "git",
-                "url": "https://github.com/symfony/http-foundation.git",
-                "reference": "e3e5a62a6631a461954d471e7206e3750dbe8ee1"
+                "url": "https://github.com/symfony/http-client-contracts.git",
+                "reference": "3a5d0fe7908daaa23e3dbf4cee3ba4bfbb19fdd3"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/http-foundation/zipball/e3e5a62a6631a461954d471e7206e3750dbe8ee1",
-                "reference": "e3e5a62a6631a461954d471e7206e3750dbe8ee1",
+                "url": "https://api.github.com/repos/symfony/http-client-contracts/zipball/3a5d0fe7908daaa23e3dbf4cee3ba4bfbb19fdd3",
+                "reference": "3a5d0fe7908daaa23e3dbf4cee3ba4bfbb19fdd3",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.2.5"
+            },
+            "suggest": {
+                "symfony/http-client-implementation": ""
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.2-dev"
+                },
+                "thanks": {
+                    "name": "symfony/contracts",
+                    "url": "https://github.com/symfony/contracts"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Contracts\\HttpClient\\": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nicolas Grekas",
+                    "email": "p@tchwork.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Generic abstractions related to HTTP clients",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "abstractions",
+                "contracts",
+                "decoupling",
+                "interfaces",
+                "interoperability",
+                "standards"
+            ],
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2020-09-07T11:33:47+00:00"
+        },
+        {
+            "name": "symfony/http-foundation",
+            "version": "v4.4.14",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/http-foundation.git",
+                "reference": "ff509ca7a73641bdbd7b56169a9004e64a58451d"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/http-foundation/zipball/ff509ca7a73641bdbd7b56169a9004e64a58451d",
+                "reference": "ff509ca7a73641bdbd7b56169a9004e64a58451d",
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@@ -2750,20 +2826,20 @@
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                 }
             ],
-            "time": "2020-08-17T07:39:58+00:00"
+            "time": "2020-09-13T05:00:26+00:00"
         },
         {
             "name": "symfony/http-kernel",
-            "version": "v4.4.13",
+            "version": "v4.4.14",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/http-kernel.git",
-                "reference": "2bb7b90ecdc79813c0bf237b7ff20e79062b5188"
+                "reference": "e3eac6daeb0c65965a6201bd2de9564a802fe0a9"
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-                "reference": "2bb7b90ecdc79813c0bf237b7ff20e79062b5188",
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+                "reference": "e3eac6daeb0c65965a6201bd2de9564a802fe0a9",
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@@ -2771,6 +2847,7 @@
                 "psr/log": "~1.0",
                 "symfony/error-handler": "^4.4",
                 "symfony/event-dispatcher": "^4.4",
+                "symfony/http-client-contracts": "^1.1|^2",
                 "symfony/http-foundation": "^4.4|^5.0",
                 "symfony/polyfill-ctype": "^1.8",
                 "symfony/polyfill-php73": "^1.9",
@@ -2855,20 +2932,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-09-02T08:09:29+00:00"
+            "time": "2020-09-27T04:25:44+00:00"
         },
         {
             "name": "symfony/mime",
-            "version": "v5.1.5",
+            "version": "v5.1.6",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/mime.git",
-                "reference": "89a2c9b4cb7b5aa516cf55f5194c384f444c81dc"
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@@ -2932,7 +3009,7 @@
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-            "time": "2020-08-17T10:01:29+00:00"
+            "time": "2020-09-02T16:23:27+00:00"
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             "name": "symfony/polyfill-ctype",
@@ -3638,16 +3715,16 @@
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         {
             "name": "symfony/process",
-            "version": "v4.4.13",
+            "version": "v4.4.14",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/process.git",
-                "reference": "65e70bab62f3da7089a8d4591fb23fbacacb3479"
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-                "reference": "65e70bab62f3da7089a8d4591fb23fbacacb3479",
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@@ -3697,20 +3774,20 @@
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-            "time": "2020-07-23T08:31:43+00:00"
+            "time": "2020-09-02T16:08:58+00:00"
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             "name": "symfony/routing",
-            "version": "v4.4.13",
+            "version": "v4.4.14",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/routing.git",
-                "reference": "e3387963565da9bae51d1d3ab8041646cc93bd04"
+                "reference": "8db77d97152f55f0df5158cc0a877ad8e16099ac"
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-                "reference": "e3387963565da9bae51d1d3ab8041646cc93bd04",
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@@ -3787,7 +3864,7 @@
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-            "time": "2020-08-10T07:27:51+00:00"
+            "time": "2020-09-02T16:08:58+00:00"
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             "name": "symfony/service-contracts",
@@ -3867,16 +3944,16 @@
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         {
             "name": "symfony/translation",
-            "version": "v4.4.13",
+            "version": "v4.4.14",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/translation.git",
-                "reference": "700e6e50174b0cdcf0fa232773bec5c314680575"
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-                "reference": "700e6e50174b0cdcf0fa232773bec5c314680575",
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@@ -3953,7 +4030,7 @@
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-            "time": "2020-08-17T09:56:45+00:00"
+            "time": "2020-09-24T09:40:01+00:00"
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         {
             "name": "symfony/translation-contracts",
@@ -4032,16 +4109,16 @@
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         {
             "name": "symfony/var-dumper",
-            "version": "v4.4.13",
+            "version": "v4.4.14",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/var-dumper.git",
-                "reference": "1bef32329f3166486ab7cb88599cae4875632b99"
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@@ -4119,7 +4196,7 @@
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-            "time": "2020-08-17T07:31:35+00:00"
+            "time": "2020-09-18T08:35:10+00:00"
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             "name": "tijsverkoyen/css-to-inline-styles",
diff --git a/public/solr.xslt b/public/solr.xslt
index be47eeb..0e4d530 100644
--- a/public/solr.xslt
+++ b/public/solr.xslt
@@ -136,6 +136,7 @@
 
                 <!-- author -->
                 <xsl:for-each select="/Opus/Rdr_Dataset/PersonAuthor">
+                    <xsl:sort select="@SortOrder"/>
                     <xsl:element name="field">
                         <xsl:attribute name="name">author</xsl:attribute>
                         <xsl:value-of select="@LastName" />
@@ -148,6 +149,7 @@
                 <xsl:element name="field">
                     <xsl:attribute name="name">author_sort</xsl:attribute>
                     <xsl:for-each select="/Opus/Rdr_Dataset/PersonAuthor">
+                        <xsl:sort select="@SortOrder"/>
                         <xsl:value-of select="@LastName" />
                         <xsl:text></xsl:text>
                         <xsl:value-of select="@FirstName" />
diff --git a/solr.xslt b/solr.xslt
index 5e6b65d..e050b22 100644
--- a/solr.xslt
+++ b/solr.xslt
@@ -134,8 +134,9 @@
                     </xsl:if>
                 </xsl:for-each>
 
-                <!-- author -->
+                  <!-- author -->
                 <xsl:for-each select="/Opus/Rdr_Dataset/PersonAuthor">
+                    <xsl:sort select="@SortOrder"/>
                     <xsl:element name="field">
                         <xsl:attribute name="name">author</xsl:attribute>
                         <xsl:value-of select="@LastName" />
@@ -148,6 +149,7 @@
                 <xsl:element name="field">
                     <xsl:attribute name="name">author_sort</xsl:attribute>
                     <xsl:for-each select="/Opus/Rdr_Dataset/PersonAuthor">
+                        <xsl:sort select="@SortOrder"/>
                         <xsl:value-of select="@LastName" />
                         <xsl:text></xsl:text>
                         <xsl:value-of select="@FirstName" />