diff --git a/src/workflow/ArcanistListWorkflow.php b/src/workflow/ArcanistListWorkflow.php
--- a/src/workflow/ArcanistListWorkflow.php
+++ b/src/workflow/ArcanistListWorkflow.php
@@ -36,7 +36,21 @@
     return true;
   }
 
+  public function getArguments() {
+    return array(
+      'owner' => array(
+        'param' => 'username',
+        'paramtype' => 'username',
+        'help' => pht(
+          'Only show tasks assigned to the given username, '.
+          'also accepts %s to show all, default is you.',
+          '@all'),
+      ),
+    );
+  }
+
   public function run() {
+    $owner      = $this->getArgument('owner');
     static $color_map = array(
       'Closed'          => 'cyan',
       'Needs Review'    => 'magenta',
@@ -47,10 +61,17 @@
       'Abandoned'       => 'default',
     );
 
+    if ($owner) {
+      $owner_phid = $this->findOwnerPHID($owner);
+    } else {
+      $owner_phid = $this->getUserPHID();
+    }
+
+
     $revisions = $this->getConduit()->callMethodSynchronous(
       'differential.query',
       array(
-        'authors' => array($this->getUserPHID()),
+        'authors' => array($owner_phid),
         'status'  => 'status-open',
       ));
 
@@ -106,4 +127,21 @@
     return 0;
   }
 
+private function findOwnerPHID($owner) {
+    $conduit = $this->getConduit();
+
+    $users = $conduit->callMethodSynchronous(
+      'user.query',
+      array(
+        'usernames' => array($owner),
+      ));
+
+    if (!$users) {
+      return null;
+    }
+
+    $user = head($users);
+    return idx($user, 'phid');
+  }
+
 }