diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -4202,6 +4202,7 @@
     'PhabricatorProjectTriggerEditor' => 'applications/project/editor/PhabricatorProjectTriggerEditor.php',
     'PhabricatorProjectTriggerInvalidRule' => 'applications/project/trigger/PhabricatorProjectTriggerInvalidRule.php',
     'PhabricatorProjectTriggerListController' => 'applications/project/controller/trigger/PhabricatorProjectTriggerListController.php',
+    'PhabricatorProjectTriggerManiphestOwnerRule' => 'applications/project/trigger/PhabricatorProjectTriggerManiphestOwnerRule.php',
     'PhabricatorProjectTriggerManiphestPriorityRule' => 'applications/project/trigger/PhabricatorProjectTriggerManiphestPriorityRule.php',
     'PhabricatorProjectTriggerManiphestStatusRule' => 'applications/project/trigger/PhabricatorProjectTriggerManiphestStatusRule.php',
     'PhabricatorProjectTriggerNameTransaction' => 'applications/project/xaction/trigger/PhabricatorProjectTriggerNameTransaction.php',
@@ -10368,6 +10369,7 @@
     'PhabricatorProjectTriggerEditor' => 'PhabricatorApplicationTransactionEditor',
     'PhabricatorProjectTriggerInvalidRule' => 'PhabricatorProjectTriggerRule',
     'PhabricatorProjectTriggerListController' => 'PhabricatorProjectTriggerController',
+    'PhabricatorProjectTriggerManiphestOwnerRule' => 'PhabricatorProjectTriggerRule',
     'PhabricatorProjectTriggerManiphestPriorityRule' => 'PhabricatorProjectTriggerRule',
     'PhabricatorProjectTriggerManiphestStatusRule' => 'PhabricatorProjectTriggerRule',
     'PhabricatorProjectTriggerNameTransaction' => 'PhabricatorProjectTriggerTransactionType',
diff --git a/src/applications/project/controller/PhabricatorProjectBoardViewController.php b/src/applications/project/controller/PhabricatorProjectBoardViewController.php
--- a/src/applications/project/controller/PhabricatorProjectBoardViewController.php
+++ b/src/applications/project/controller/PhabricatorProjectBoardViewController.php
@@ -577,6 +577,11 @@
       $panel->addHeaderAction($column_menu);
 
       if ($column->canHaveTrigger()) {
+        $trigger = $column->getTrigger();
+        if ($trigger) {
+          $trigger->setViewer($viewer);
+        }
+
         $trigger_menu = $this->buildTriggerMenu($column);
         $panel->addHeaderAction($trigger_menu);
       }
diff --git a/src/applications/project/controller/trigger/PhabricatorProjectTriggerEditController.php b/src/applications/project/controller/trigger/PhabricatorProjectTriggerEditController.php
--- a/src/applications/project/controller/trigger/PhabricatorProjectTriggerEditController.php
+++ b/src/applications/project/controller/trigger/PhabricatorProjectTriggerEditController.php
@@ -25,6 +25,8 @@
       $trigger = PhabricatorProjectTrigger::initializeNewTrigger();
     }
 
+    $trigger->setViewer($viewer);
+
     $column_phid = $request->getStr('columnPHID');
     if ($column_phid) {
       $column = id(new PhabricatorProjectColumnQuery())
@@ -272,6 +274,10 @@
     $rule_list = array_values($rule_list);
 
     $type_list = PhabricatorProjectTriggerRule::getAllTriggerRules();
+
+    foreach ($type_list as $rule) {
+      $rule->setViewer($this->getViewer());
+    }
     $type_list = mpull($type_list, 'newTemplate');
     $type_list = array_values($type_list);
 
diff --git a/src/applications/project/controller/trigger/PhabricatorProjectTriggerViewController.php b/src/applications/project/controller/trigger/PhabricatorProjectTriggerViewController.php
--- a/src/applications/project/controller/trigger/PhabricatorProjectTriggerViewController.php
+++ b/src/applications/project/controller/trigger/PhabricatorProjectTriggerViewController.php
@@ -20,6 +20,7 @@
     if (!$trigger) {
       return new Aphront404Response();
     }
+    $trigger->setViewer($viewer);
 
     $rules_view = $this->newRulesView($trigger);
     $columns_view = $this->newColumnsView($trigger);
diff --git a/src/applications/project/storage/PhabricatorProjectTrigger.php b/src/applications/project/storage/PhabricatorProjectTrigger.php
--- a/src/applications/project/storage/PhabricatorProjectTrigger.php
+++ b/src/applications/project/storage/PhabricatorProjectTrigger.php
@@ -13,6 +13,7 @@
   protected $editPolicy;
 
   private $triggerRules;
+  private $viewer;
   private $usage = self::ATTACHABLE;
 
   public static function initializeNewTrigger() {
@@ -41,6 +42,15 @@
     return PhabricatorProjectTriggerPHIDType::TYPECONST;
   }
 
+  public function getViewer() {
+    return $this->viewer;
+  }
+
+  public function setViewer(PhabricatorUser $user) {
+    $this->viewer = $user;
+    return $this;
+  }
+
   public function getDisplayName() {
     $name = $this->getName();
     if (strlen($name)) {
@@ -72,11 +82,16 @@
     parent::setRuleset($ruleset);
   }
 
-  public function getTriggerRules() {
+  public function getTriggerRules($viewer = null) {
     if ($this->triggerRules === null) {
+      if (!$viewer) {
+        $viewer = $this->getViewer();
+      }
+
       $trigger_rules = self::newTriggerRulesFromRuleSpecifications(
         $this->getRuleset(),
-        $allow_invalid = true);
+        $allow_invalid = true,
+        $viewer);
 
       $this->triggerRules = $trigger_rules;
     }
@@ -86,7 +101,8 @@
 
   public static function newTriggerRulesFromRuleSpecifications(
     array $list,
-    $allow_invalid) {
+    $allow_invalid,
+    PhabricatorUser $viewer) {
 
     // NOTE: With "$allow_invalid" set, we're  trying to preserve the database
     // state in the rule structure, even if it includes rule types we don't
@@ -124,7 +140,7 @@
       if (!is_array($rule)) {
         throw new PhabricatorProjectTriggerCorruptionException(
           pht(
-            'Trigger ruleset is corrupt: rule (with key "%s") should be a '.
+            'Trigger ruleset is corrupt: rule (at index "%s") should be a '.
             'rule specification, but is actually "%s".',
             $key,
             phutil_describe_type($rule)));
@@ -140,7 +156,7 @@
       } catch (PhutilTypeCheckException $ex) {
         throw new PhabricatorProjectTriggerCorruptionException(
           pht(
-            'Trigger ruleset is corrupt: rule (with key "%s") is not a '.
+            'Trigger ruleset is corrupt: rule (at index "%s") is not a '.
             'valid rule specification: %s',
             $key,
             $ex->getMessage()));
@@ -179,6 +195,7 @@
           ->setRecord($record)
           ->setException($ex);
       }
+      $rule->setViewer($viewer);
 
       $trigger_rules[] = $rule;
     }
@@ -206,9 +223,8 @@
     $object) {
 
     $trigger_xactions = array();
-    foreach ($this->getTriggerRules() as $rule) {
+    foreach ($this->getTriggerRules($viewer) as $rule) {
       $rule
-        ->setViewer($viewer)
         ->setTrigger($this)
         ->setColumn($column)
         ->setObject($object);
diff --git a/src/applications/project/trigger/PhabricatorProjectTriggerManiphestOwnerRule.php b/src/applications/project/trigger/PhabricatorProjectTriggerManiphestOwnerRule.php
new file mode 100644
--- /dev/null
+++ b/src/applications/project/trigger/PhabricatorProjectTriggerManiphestOwnerRule.php
@@ -0,0 +1,126 @@
+<?php
+
+final class PhabricatorProjectTriggerManiphestOwnerRule
+  extends PhabricatorProjectTriggerRule {
+
+  const TRIGGERTYPE = 'task.owner';
+
+  public function getSelectControlName() {
+    return pht('Assign task to');
+  }
+
+  protected function getValueForEditorField() {
+    return $this->getDatasource()->getWireTokens($this->getValue());
+  }
+
+  private function convertTokenizerValueToOwner($value) {
+    $value = head($value);
+    if ($value === PhabricatorPeopleNoOwnerDatasource::FUNCTION_TOKEN) {
+      $value = null;
+    }
+    return $value;
+  }
+
+  protected function assertValidRuleValue($value) {
+    if (!is_array($value)) {
+      throw new Exception(
+        pht(
+          'Owner rule value should be a list, but is not (value is "%s").',
+          phutil_describe_type($value)));
+    }
+
+    if (count($value) != 1) {
+      throw new Exception(
+        pht(
+          'Owner rule value should be a list of exactly one user PHID, or the '.
+          'token "none()" (value is "%s").',
+          implode(', ', $value)));
+    }
+  }
+
+  protected function newDropTransactions($object, $value) {
+    $value = $this->convertTokenizerValueToOwner($value);
+    return array(
+      $this->newTransaction()
+        ->setTransactionType(ManiphestTaskOwnerTransaction::TRANSACTIONTYPE)
+        ->setNewValue($value),
+    );
+  }
+
+  protected function newDropEffects($value) {
+    $owner_value = $this->convertTokenizerValueToOwner($value);
+
+    return array(
+      $this->newEffect()
+        ->setIcon('fa-user')
+        ->setContent($this->getRuleViewDescription($value))
+        ->addCondition('owner', '!=', $owner_value),
+    );
+  }
+
+  protected function getDefaultValue() {
+    return null;
+  }
+
+  protected function getPHUIXControlType() {
+    return 'tokenizer';
+  }
+
+  protected function getDatasource() {
+    $datasource = id(new ManiphestAssigneeDatasource())
+      ->setLimit(1);
+
+    if ($this->getViewer()) {
+      $datasource->setViewer($this->getViewer());
+    }
+
+    return $datasource;
+  }
+
+  protected function getPHUIXControlSpecification() {
+    $template = id(new AphrontTokenizerTemplateView())
+      ->setViewer($this->getViewer());
+
+    $template_markup = $template->render();
+    $datasource = $this->getDatasource();
+
+    return array(
+      'markup' => (string)hsprintf('%s', $template_markup),
+      'config' => array(
+        'src' => $datasource->getDatasourceURI(),
+        'browseURI' => $datasource->getBrowseURI(),
+        'placeholder' => $datasource->getPlaceholderText(),
+        'limit' => $datasource->getLimit(),
+      ),
+      'value' => null,
+    );
+  }
+
+  public function getRuleViewLabel() {
+    return pht('Change Owner');
+  }
+
+  public function getRuleViewDescription($value) {
+    $value = $this->convertTokenizerValueToOwner($value);
+
+    if (!$value) {
+      return pht('Unassign task.');
+    } else {
+      return pht(
+        'Assign task to %s.',
+        phutil_tag(
+          'strong',
+          array(),
+          $this->getViewer()
+            ->renderHandle($value)
+            ->render()));
+    }
+  }
+
+  public function getRuleViewIcon($value) {
+    return id(new PHUIIconView())
+      ->setIcon('fa-user', 'green');
+  }
+
+
+}
diff --git a/src/applications/project/trigger/PhabricatorProjectTriggerRule.php b/src/applications/project/trigger/PhabricatorProjectTriggerRule.php
--- a/src/applications/project/trigger/PhabricatorProjectTriggerRule.php
+++ b/src/applications/project/trigger/PhabricatorProjectTriggerRule.php
@@ -37,6 +37,10 @@
     return $this->getRecord()->getValue();
   }
 
+  protected function getValueForEditorField() {
+    return $this->getValue();
+  }
+
   abstract public function getSelectControlName();
   abstract public function getRuleViewLabel();
   abstract public function getRuleViewDescription($value);
@@ -130,7 +134,7 @@
 
     return array(
       'type' => $record->getType(),
-      'value' => $record->getValue(),
+      'value' => $this->getValueForEditorField(),
       'isValidRule' => $is_valid,
       'invalidView' => $invalid_view,
     );
diff --git a/src/applications/project/xaction/trigger/PhabricatorProjectTriggerRulesetTransaction.php b/src/applications/project/xaction/trigger/PhabricatorProjectTriggerRulesetTransaction.php
--- a/src/applications/project/xaction/trigger/PhabricatorProjectTriggerRulesetTransaction.php
+++ b/src/applications/project/xaction/trigger/PhabricatorProjectTriggerRulesetTransaction.php
@@ -28,7 +28,8 @@
       try {
         PhabricatorProjectTrigger::newTriggerRulesFromRuleSpecifications(
           $ruleset,
-          $allow_invalid = false);
+          $allow_invalid = false,
+          $xaction->getViewer());
       } catch (PhabricatorProjectTriggerCorruptionException $ex) {
         $errors[] = $this->newInvalidError(
           pht(