diff --git a/src/applications/differential/customfield/DifferentialAuthorField.php b/src/applications/differential/customfield/DifferentialAuthorField.php
index 6e14c8bbae..bac57755ab 100644
--- a/src/applications/differential/customfield/DifferentialAuthorField.php
+++ b/src/applications/differential/customfield/DifferentialAuthorField.php
@@ -32,7 +32,7 @@ final class DifferentialAuthorField
   }
 
   public function renderPropertyViewValue(array $handles) {
-    return $handles[$this->getObject()->getAuthorPHID()]->renderLink();
+    return $handles[$this->getObject()->getAuthorPHID()]->renderHovercardLink();
   }
 
 }
diff --git a/src/applications/differential/view/DifferentialReviewersView.php b/src/applications/differential/view/DifferentialReviewersView.php
index 5dd7c09d73..ac4e482278 100644
--- a/src/applications/differential/view/DifferentialReviewersView.php
+++ b/src/applications/differential/view/DifferentialReviewersView.php
@@ -120,7 +120,7 @@ final class DifferentialReviewersView extends AphrontView {
 
       }
 
-      $item->setTarget($handle->renderLink());
+      $item->setTarget($handle->renderHovercardLink());
       $view->addItem($item);
     }
 
diff --git a/src/applications/maniphest/controller/ManiphestTaskDetailController.php b/src/applications/maniphest/controller/ManiphestTaskDetailController.php
index e5e5083664..b2b49b43d4 100644
--- a/src/applications/maniphest/controller/ManiphestTaskDetailController.php
+++ b/src/applications/maniphest/controller/ManiphestTaskDetailController.php
@@ -208,19 +208,26 @@ final class ManiphestTaskDetailController extends ManiphestController {
       ->setObject($task)
       ->setActionList($actions);
 
-    $view->addProperty(
-      pht('Assigned To'),
-      $task->getOwnerPHID()
-        ? $handles->renderHandle($task->getOwnerPHID())
-        : phutil_tag('em', array(), pht('None')));
+    $owner_phid = $task->getOwnerPHID();
+    if ($owner_phid) {
+      $assigned_to = $handles
+        ->renderHandle($owner_phid)
+        ->setShowHovercard(true);
+    } else {
+      $assigned_to = phutil_tag('em', array(), pht('None'));
+    }
+
+    $view->addProperty(pht('Assigned To'), $assigned_to);
 
     $view->addProperty(
       pht('Priority'),
       ManiphestTaskPriority::getTaskPriorityName($task->getPriority()));
 
-    $view->addProperty(
-      pht('Author'),
-      $handles->renderHandle($task->getAuthorPHID()));
+    $author = $handles
+      ->renderHandle($task->getAuthorPHID())
+      ->setShowHovercard(true);
+
+    $view->addProperty(pht('Author'), $author);
 
     $source = $task->getOriginalEmailSource();
     if ($source) {
diff --git a/src/applications/phid/PhabricatorObjectHandle.php b/src/applications/phid/PhabricatorObjectHandle.php
index 283ad0fb63..4eb6178338 100644
--- a/src/applications/phid/PhabricatorObjectHandle.php
+++ b/src/applications/phid/PhabricatorObjectHandle.php
@@ -248,6 +248,23 @@ final class PhabricatorObjectHandle
 
 
   public function renderLink($name = null) {
+    return $this->renderLinkWithAttributes($name, array());
+  }
+
+  public function renderHovercardLink($name = null) {
+    Javelin::initBehavior('phabricator-hovercards');
+
+    $attributes = array(
+      'sigil' => 'hovercard',
+      'meta' => array(
+        'hoverPHID' => $this->getPHID(),
+      ),
+    );
+
+    return $this->renderLinkWithAttributes($name, $attributes);
+  }
+
+  private function renderLinkWithAttributes($name, array $attributes) {
     if ($name === null) {
       $name = $this->getLinkName();
     }
@@ -275,13 +292,15 @@ final class PhabricatorObjectHandle
         ->setIconFont('fa-lock lightgreytext');
     }
 
-    return phutil_tag(
+    $attributes = $attributes + array(
+      'href'  => $uri,
+      'class' => implode(' ', $classes),
+      'title' => $title,
+    );
+
+    return javelin_tag(
       $uri ? 'a' : 'span',
-      array(
-        'href'  => $uri,
-        'class' => implode(' ', $classes),
-        'title' => $title,
-      ),
+      $attributes,
       array($icon, $name));
   }
 
diff --git a/src/applications/phid/view/PHUIHandleListView.php b/src/applications/phid/view/PHUIHandleListView.php
index 7ec0ce7606..cc9f3d00bd 100644
--- a/src/applications/phid/view/PHUIHandleListView.php
+++ b/src/applications/phid/view/PHUIHandleListView.php
@@ -34,9 +34,14 @@ final class PHUIHandleListView
   }
 
   protected function getTagContent() {
+    $list = $this->handleList;
     $items = array();
-    foreach ($this->handleList as $handle) {
-      $items[] = $handle->renderLink();
+    foreach ($list as $handle) {
+      $view = $list->renderHandle($handle->getPHID());
+
+      $view->setShowHovercard(true);
+
+      $items[] = $view;
     }
 
     if ($this->getAsInline()) {
diff --git a/src/applications/phid/view/PHUIHandleTagListView.php b/src/applications/phid/view/PHUIHandleTagListView.php
index f5ebe33d65..73cbef2350 100644
--- a/src/applications/phid/view/PHUIHandleTagListView.php
+++ b/src/applications/phid/view/PHUIHandleTagListView.php
@@ -7,6 +7,7 @@ final class PHUIHandleTagListView extends AphrontTagView {
   private $limit;
   private $noDataString;
   private $slim;
+  private $showHovercards;
 
   public function setHandles(array $handles) {
     $this->handles = $handles;
@@ -33,6 +34,11 @@ final class PHUIHandleTagListView extends AphrontTagView {
     return $this;
   }
 
+  public function setShowHovercards($show_hovercards) {
+    $this->showHovercards = $show_hovercards;
+    return $this;
+  }
+
   protected function getTagName() {
     return 'ul';
   }
@@ -62,6 +68,9 @@ final class PHUIHandleTagListView extends AphrontTagView {
     $list = array();
     foreach ($handles as $handle) {
       $tag = $handle->renderTag();
+      if ($this->showHovercards) {
+        $tag->setPHID($handle->getPHID());
+      }
       if ($this->slim) {
         $tag->setSlimShady(true);
       }
diff --git a/src/applications/phid/view/PHUIHandleView.php b/src/applications/phid/view/PHUIHandleView.php
index a4b766a991..f4bce39662 100644
--- a/src/applications/phid/view/PHUIHandleView.php
+++ b/src/applications/phid/view/PHUIHandleView.php
@@ -15,6 +15,7 @@ final class PHUIHandleView
   private $handlePHID;
   private $asTag;
   private $useShortName;
+  private $showHovercard;
 
   public function setHandleList(PhabricatorHandleList $list) {
     $this->handleList = $list;
@@ -36,17 +37,37 @@ final class PHUIHandleView
     return $this;
   }
 
+  public function setShowHovercard($hovercard) {
+    $this->showHovercard = $hovercard;
+    return $this;
+  }
+
   public function render() {
     $handle = $this->handleList[$this->handlePHID];
+
     if ($this->asTag) {
-      return $handle->renderTag();
-    } else {
-      if ($this->useShortName) {
-        return $handle->renderLink($handle->getName());
-      } else {
-        return $handle->renderLink();
+      $tag = $handle->renderTag();
+
+      if ($this->showHovercard) {
+        $tag->setPHID($handle->getPHID());
       }
+
+      return $tag;
     }
+
+    if ($this->useShortName) {
+      $name = $handle->getName();
+    } else {
+      $name = null;
+    }
+
+    if ($this->showHovercard) {
+      $link = $handle->renderHovercardLink($name);
+    } else {
+      $link = $handle->renderLink($name);
+    }
+
+    return $link;
   }
 
 }
diff --git a/src/applications/project/events/PhabricatorProjectUIEventListener.php b/src/applications/project/events/PhabricatorProjectUIEventListener.php
index 326a9b9878..55a4a2c4a0 100644
--- a/src/applications/project/events/PhabricatorProjectUIEventListener.php
+++ b/src/applications/project/events/PhabricatorProjectUIEventListener.php
@@ -101,7 +101,8 @@ final class PhabricatorProjectUIEventListener
     if ($handles) {
       $list = id(new PHUIHandleTagListView())
         ->setHandles($handles)
-        ->setAnnotations($annotations);
+        ->setAnnotations($annotations)
+        ->setShowHovercards(true);
     } else {
       $list = phutil_tag('em', array(), pht('None'));
     }
diff --git a/src/applications/subscriptions/view/SubscriptionListStringBuilder.php b/src/applications/subscriptions/view/SubscriptionListStringBuilder.php
index e8761e554e..7ccc729241 100644
--- a/src/applications/subscriptions/view/SubscriptionListStringBuilder.php
+++ b/src/applications/subscriptions/view/SubscriptionListStringBuilder.php
@@ -57,7 +57,7 @@ final class SubscriptionListStringBuilder extends Phobject {
     // link. Instead, render "a, b, c, d" in this case, and then when we get one
     // more render "a, b, c, and 2 others".
     if ($subscribers_count <= ($show_count + 1)) {
-      return phutil_implode_html(', ', mpull($handles, 'renderLink'));
+      return phutil_implode_html(', ', mpull($handles, 'renderHovercardLink'));
     }
 
     $show = array_slice($handles, 0, $show_count);
diff --git a/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldPHIDs.php b/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldPHIDs.php
index 855cf2b4a0..b9b1bf6505 100644
--- a/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldPHIDs.php
+++ b/src/infrastructure/customfield/standard/PhabricatorStandardCustomFieldPHIDs.php
@@ -83,7 +83,7 @@ abstract class PhabricatorStandardCustomFieldPHIDs
       return null;
     }
 
-    $handles = mpull($handles, 'renderLink');
+    $handles = mpull($handles, 'renderHovercardLink');
     $handles = phutil_implode_html(', ', $handles);
     return $handles;
   }