diff --git a/src/applications/project/editor/PhabricatorProjectTransactionEditor.php b/src/applications/project/editor/PhabricatorProjectTransactionEditor.php
--- a/src/applications/project/editor/PhabricatorProjectTransactionEditor.php
+++ b/src/applications/project/editor/PhabricatorProjectTransactionEditor.php
@@ -219,7 +219,12 @@
 
     foreach ($xactions as $xaction) {
       switch ($xaction->getTransactionType()) {
-        case PhabricatorProjectTransaction::TYPE_MEMBERS:
+        case PhabricatorTransactions::TYPE_EDGE:
+          $type = $xaction->getMetadataValue('edge:type');
+          if ($type != PhabricatorProjectProjectHasMemberEdgeType::EDGECONST) {
+            break;
+          }
+
           if ($is_parent) {
             $errors[] = new PhabricatorApplicationTransactionValidationError(
               $xaction->getTransactionType(),
@@ -792,27 +797,6 @@
 
     $results = parent::expandTransactions($object, $xactions);
 
-    // Automatically add the author as a member when they create a project
-    // if they're using the web interface.
-
-    $content_source = $this->getContentSource();
-    $source_web = PhabricatorContentSource::SOURCE_WEB;
-    $is_web = ($content_source->getSource() === $source_web);
-
-    if ($this->getIsNewObject() && $is_web) {
-      if ($actor_phid) {
-        $type_member = PhabricatorProjectProjectHasMemberEdgeType::EDGECONST;
-
-        $results[] = id(new PhabricatorProjectTransaction())
-          ->setTransactionType(PhabricatorTransactions::TYPE_EDGE)
-          ->setMetadataValue('edge:type', $type_member)
-          ->setNewValue(
-            array(
-              '+' => array($actor_phid => $actor_phid),
-            ));
-      }
-    }
-
     $is_milestone = $object->isMilestone();
     foreach ($xactions as $xaction) {
       switch ($xaction->getTransactionType()) {
diff --git a/src/applications/project/engine/PhabricatorProjectEditEngine.php b/src/applications/project/engine/PhabricatorProjectEditEngine.php
--- a/src/applications/project/engine/PhabricatorProjectEditEngine.php
+++ b/src/applications/project/engine/PhabricatorProjectEditEngine.php
@@ -176,7 +176,7 @@
       $milestone_phid = null;
     }
 
-    return array(
+    $fields = array(
       id(new PhabricatorHandlesEditField())
         ->setKey('parent')
         ->setLabel(pht('Parent'))
@@ -243,6 +243,49 @@
         ->setConduitTypeDescription(pht('New list of slugs.'))
         ->setValue($slugs),
     );
+
+    $can_edit_members = (!$milestone) &&
+                        (!$object->isMilestone()) &&
+                        (!$object->getHasSubprojects());
+
+    if ($can_edit_members) {
+
+      // Show this on the web UI when creating a project, but not when editing
+      // one. It is always available via Conduit.
+      $conduit_only = !$this->getIsCreate();
+
+      $members_field = id(new PhabricatorUsersEditField())
+        ->setKey('members')
+        ->setAliases(array('memberPHIDs'))
+        ->setLabel(pht('Initial Members'))
+        ->setIsConduitOnly($conduit_only)
+        ->setUseEdgeTransactions(true)
+        ->setTransactionType(PhabricatorTransactions::TYPE_EDGE)
+        ->setMetadataValue(
+          'edge:type',
+          PhabricatorProjectProjectHasMemberEdgeType::EDGECONST)
+        ->setDescription(pht('Initial project members.'))
+        ->setConduitDescription(pht('Set project members.'))
+        ->setConduitTypeDescription(pht('New list of members.'))
+        ->setValue(array());
+
+      $members_field->setViewer($this->getViewer());
+
+      $edit_add = $members_field->getConduitEditType('members.add')
+        ->setConduitDescription(pht('Add members.'));
+
+      $edit_set = $members_field->getConduitEditType('members.set')
+        ->setConduitDescription(
+          pht('Set members, overwriting the current value.'));
+
+      $edit_rem = $members_field->getConduitEditType('members.remove')
+        ->setConduitDescription(pht('Remove members.'));
+
+      $fields[] = $members_field;
+    }
+
+    return $fields;
+
   }
 
 }