diff --git a/app/library/Auth.php b/app/library/Auth.php
index 81750da..33a46f4 100644
--- a/app/library/Auth.php
+++ b/app/library/Auth.php
@@ -10,6 +10,7 @@ use App\Model\Data\User,
 class Auth extends Injectable
 {
     const SESSION_KEY = 'auth';
+    const IMPERSONATEOR_ID = 'auth.impersonateor';
 
     /**
      * Login using email/user + password combination.
@@ -86,6 +87,34 @@ class Auth extends Injectable
         $this->eventsManager->fire('auth:onLogin', $this, 'System');
     }
 
+    /**
+     * Impersonate a user
+     *
+     * @param User $user
+     */
+    public function impersonate(User $user)
+    {
+        $current = $this->getIdentity();
+        if ($current === null) {
+            throw new \InvalidArgumentException("Need to be authenticated to be able to impersonate someone");
+        }
+
+        if ($current->getId() === $user->getId()) {
+            // Same user
+            throw new \DomainException("Can't impersonate yourself");
+        }
+
+        $this->session->set(self::IMPERSONATEOR_ID, $current->getId());
+        $this->setIdentity($user->getId());
+        $this->eventsManager->fire('auth:onImpersonate', $this, $current);
+    }
+
+    public function impersonateClear($imp_id)
+    {
+        $this->session->remove(self::IMPERSONATEOR_ID);
+        $this->session->set(self::SESSION_KEY, $imp_id);
+    }
+
     /**
      * @param $identity
      * @return Auth
@@ -135,7 +164,12 @@ class Auth extends Injectable
      */
     public function clearIdentity()
     {
-        $this->session->remove(self::SESSION_KEY);
+        $imp_id = $this->session->get(self::IMPERSONATEOR_ID);
+        if ($imp_id !== null) {
+            $this->impersonateClear($imp_id);
+        } else {
+            $this->session->remove(self::SESSION_KEY);
+        }
         return $this;
     }
 }