diff --git a/app/controllers/resources/admin.php b/app/controllers/resources/admin.php
index 7639ed02c03640322a7d16948537d801f87d17c6..4f413be98f415cfd72aa6ea16ba337d5650e5b7d 100644
--- a/app/controllers/resources/admin.php
+++ b/app/controllers/resources/admin.php
@@ -196,6 +196,32 @@ class Resources_AdminController extends AuthenticatedController
                 $last_activity_date = $this->now->sub($this->last_activity);
                 $this->last_activity_date = $last_activity_date->format('d.m.Y H:i');
             }
+        } else {
+            //No user selected. Show a list of all users that have
+            //at least one permission in the room management system.
+            if ($user_id) {
+                //User-ID specified, but no user could be found.
+                PageLayout::postError(
+                    _('Die angegebene Person wurde nicht gefunden!')
+                );
+            }
+
+            $this->users = User::findBySql(
+                '`user_id` IN (
+                    SELECT `user_id`
+                    FROM `resource_permissions`
+                    UNION
+                    SELECT `user_id`
+                    FROM `resource_temporary_permissions`
+                )
+                ORDER BY `nachname` ASC, `vorname` ASC'
+            );
+            if (!$this->users) {
+                //No user found.
+                PageLayout::postInfo(
+                    _('Es gibt keine Personen, zu denen Berechtigungen in der Raumverwaltung eingetragen sind!')
+                );
+            }
         }
     }
 
diff --git a/app/views/resources/admin/user_permissions.php b/app/views/resources/admin/user_permissions.php
index 9035b9518fcabe6f7707fd537c95df9d214bcd77..23378a5c42cf92309662a91221e79ff335f6c477 100644
--- a/app/views/resources/admin/user_permissions.php
+++ b/app/views/resources/admin/user_permissions.php
@@ -206,8 +206,34 @@
             </tbody>
         </table>
     <? endif ?>
-<? else: ?>
-    <?= MessageBox::info(
-        _('Es wurde keine Person ausgewählt!')
-    ) ?>
+<? elseif ($users) : ?>
+    <table class="default sortable-table" data-sortlist="[[0, 0]]">
+        <caption>
+            <?= _('Personen mit Berechtigungen an der Raumverwaltung') ?>
+        </caption>
+        <thead>
+            <tr>
+                <th data-sort="text"><?= _('Nachname, Vorname') ?></th>
+            </tr>
+        </thead>
+        <tbody>
+            <? foreach ($users as $user) : ?>
+                <tr>
+                    <td>
+                        <a href="<?= $controller->link_for(
+                                 'resources/admin/user_permissions',
+                                 ['user_id' => $user->id]
+                                 ) ?>">
+                            <?= htmlReady($user->getFullName('full_rev')) ?>
+                            <?= Icon::create('link-intern')->asImg(
+                                [
+                                    'class' => 'text-bottom'
+                                ]
+                            ) ?>
+                        </a>
+                    </td>
+                </tr>
+            <? endforeach ?>
+        </tbody>
+    </table>
 <? endif ?>