diff --git a/config/packages/mapping/ActivityEntity.orm.xml b/config/packages/mapping/ActivityEntity.orm.xml
index 3f1baa3..7ffc421 100644
--- a/config/packages/mapping/ActivityEntity.orm.xml
+++ b/config/packages/mapping/ActivityEntity.orm.xml
@@ -6,8 +6,8 @@
 		<field name="endDate" type="date" column="endDate" nullable="true"/>
 		<field name="realStartDate" type="date" column="realStartDate" nullable="true"/>
 		<field name="realEndDate" type="date" column="realEndDate" nullable="true"/>
-		<many-to-one field="actor" target-entity="ActorEntity" nullable="true">
-			<join-column name="actor" referenced-column-name="id"/>
+		<many-to-one field="actor" target-entity="ActorEntity" nullable="true" inversed-by="App\Entity\ActivityEntity">
+			<join-column name="actor" referenced-column-name="id" on-delete="SET NULL"/>
 		</many-to-one>
 		<field name="status" type="string" column="status"/>
 	</entity>
diff --git a/config/packages/mapping/ActorEntity.orm.xml b/config/packages/mapping/ActorEntity.orm.xml
index 825bfce..4361fcb 100644
--- a/config/packages/mapping/ActorEntity.orm.xml
+++ b/config/packages/mapping/ActorEntity.orm.xml
@@ -5,5 +5,6 @@
         <field name="lastName" type="string" column="lastName" length="32"/>
         <field name="nickname" type="string" column="nickname" length="32"/>
         <field name="active" type="boolean" column="active" />
+        <one-to-many field="activities" target-entity="ActivityEntity" mapped-by="App\Entity\ActorEntity"/>
     </entity>
 </doctrine-mapping>
\ No newline at end of file
diff --git a/src/Entity/ActorEntity.php b/src/Entity/ActorEntity.php
index 074a272..fa2da43 100644
--- a/src/Entity/ActorEntity.php
+++ b/src/Entity/ActorEntity.php
@@ -2,6 +2,7 @@
 namespace App\Entity;
 
 use App\Helper\StringGenerationHelper;
+use Doctrine\Common\Collections\ArrayCollection;
 
 /**
  * Entity for workspaces
@@ -24,6 +25,17 @@
     /** @var bool If the actor is still active, if set to false, he will not be proposed when setting and actor to a taks or activity */
     protected $active = True;
 
+    /** @var ArrayCollection List of related activities */
+    protected $activities = Null;
+
+    /**
+     * Init entity
+     */
+    public function __construct()
+    {
+        $this->activities = new ArrayCollection();
+    }
+
     /**
      * Get the unique ID the entity
      *
@@ -143,7 +155,9 @@
     }
 
     /**
-     * Get the display name of the actor. Equals nickname if set, Firstname LASTNAME else.
+     * Get the display name of the actor.
+     * Equals nickname if set, Firstname LASTNAME else.
+     *
      * @return string
      */
     public function getDisplayName(): string
@@ -173,4 +187,28 @@
 
         return $this;
     }
+
+    /**
+     * *
+     * Get the list of activities
+     *
+     * @return ArrayCollection
+     */
+    public function getActivities(): ArrayCollection
+    {
+        return $this->activities;
+    }
+
+    /**
+     * Set list of activities
+     *
+     * @param ArrayCollection $activities
+     * @return self
+     */
+    public function setActivities(ArrayCollection $activities): self
+    {
+        $this->activities = $activities;
+
+        return $this;
+    }
 }
\ No newline at end of file