diff --git a/hooks/contact_groups_changed.go b/hooks/contact_groups_changed.go
index 6c392e440..b0cce66d4 100644
--- a/hooks/contact_groups_changed.go
+++ b/hooks/contact_groups_changed.go
@@ -5,7 +5,6 @@ import (
 
 	"github.com/gomodule/redigo/redis"
 	"github.com/jmoiron/sqlx"
-	"github.com/lib/pq"
 	"github.com/nyaruka/goflow/flows"
 	"github.com/nyaruka/goflow/flows/events"
 	"github.com/nyaruka/mailroom/models"
@@ -68,18 +67,6 @@ func (h *CommitGroupChangesHook) Apply(ctx context.Context, tx *sqlx.Tx, rp *red
 		return errors.Wrapf(err, "error removing contacts from groups")
 	}
 
-	// build the list of all contact ids changed, we'll update modified_on for them
-	changedIDs := make([]models.ContactID, 0, len(changed))
-	for c := range changed {
-		changedIDs = append(changedIDs, c)
-	}
-	if len(changedIDs) > 0 {
-		_, err = tx.ExecContext(ctx, `UPDATE contacts_contact SET modified_on = NOW() WHERE id = ANY($1)`, pq.Array(changedIDs))
-		if err != nil {
-			return errors.Wrapf(err, "error updating contacts modified_on")
-		}
-	}
-
 	return nil
 }
 
diff --git a/web/contact/contact.go b/web/contact/contact.go
index 4f77fcb37..52f88aba9 100644
--- a/web/contact/contact.go
+++ b/web/contact/contact.go
@@ -338,17 +338,12 @@ func handleModify(ctx context.Context, s *web.Server, r *http.Request) (interfac
 		return nil, http.StatusInternalServerError, errors.Wrapf(err, "error starting transaction")
 	}
 
-	modifiedContactIDs := make([]models.ContactID, 0, len(contacts))
-
 	// apply our events
 	for _, scene := range scenes {
 		err := models.HandleEvents(ctx, tx, s.RP, org, scene, results[scene.ContactID()].Events)
 		if err != nil {
 			return nil, http.StatusInternalServerError, errors.Wrapf(err, "error applying events")
 		}
-		if len(results[scene.ContactID()].Events) > 0 {
-			modifiedContactIDs = append(modifiedContactIDs, scene.ContactID())
-		}
 	}
 
 	// gather all our pre commit events, group them by hook and apply them
@@ -357,12 +352,6 @@ func handleModify(ctx context.Context, s *web.Server, r *http.Request) (interfac
 		return nil, http.StatusInternalServerError, errors.Wrapf(err, "error applying pre commit hooks")
 	}
 
-	// apply modified_by
-	err = models.UpdateContactModifiedBy(ctx, tx, modifiedContactIDs, request.UserID)
-	if err != nil {
-		return nil, http.StatusInternalServerError, errors.Wrapf(err, "error applying modified_by")
-	}
-
 	// commit our transaction
 	err = tx.Commit()
 	if err != nil {
diff --git a/web/contact/testdata/modify.json b/web/contact/testdata/modify.json
index 916273895..31b23cad6 100644
--- a/web/contact/testdata/modify.json
+++ b/web/contact/testdata/modify.json
@@ -1125,5 +1125,95 @@
                 "count": 0
             }
         ]
+    },
+    {
+        "label": "multiple modifiers of different types",
+        "method": "POST",
+        "path": "/mr/contact/modify",
+        "body": {
+            "org_id": 1,
+            "contact_ids": [
+                10000
+            ],
+            "modifiers": [
+                {
+                    "type": "name",
+                    "name": "Juan"
+                },
+                {
+                    "type": "language",
+                    "language": "spa"
+                },
+                {
+                    "type": "groups",
+                    "modification": "add",
+                    "groups": [
+                        {
+                            "name": "Testers",
+                            "uuid": "5e9d8fab-5e7e-4f51-b533-261af5dea70d"
+                        }
+                    ]
+                },
+                {
+                    "type": "urns",
+                    "modification": "set",
+                    "urns": [
+                        "tel:+255788555111"
+                    ]
+                }
+            ]
+        },
+        "status": 200,
+        "response": {
+            "10000": {
+                "contact": {
+                    "uuid": "6393abc0-283d-4c9b-a1b3-641a035c34bf",
+                    "id": 10000,
+                    "name": "Juan",
+                    "language": "spa",
+                    "status": "active",
+                    "timezone": "America/Los_Angeles",
+                    "created_on": "2018-07-06T12:30:00.123457Z",
+                    "urns": [
+                        "tel:+255788555111"
+                    ],
+                    "groups": [
+                        {
+                            "uuid": "5e9d8fab-5e7e-4f51-b533-261af5dea70d",
+                            "name": "Testers"
+                        }
+                    ]
+                },
+                "events": [
+                    {
+                        "type": "contact_name_changed",
+                        "created_on": "2018-07-06T12:30:00.123456789Z",
+                        "name": "Juan"
+                    },
+                    {
+                        "type": "contact_language_changed",
+                        "created_on": "2018-07-06T12:30:01.123456789Z",
+                        "language": "spa"
+                    },
+                    {
+                        "type": "contact_groups_changed",
+                        "created_on": "2018-07-06T12:30:02.123456789Z",
+                        "groups_added": [
+                            {
+                                "uuid": "5e9d8fab-5e7e-4f51-b533-261af5dea70d",
+                                "name": "Testers"
+                            }
+                        ]
+                    },
+                    {
+                        "type": "contact_urns_changed",
+                        "created_on": "2018-07-06T12:30:03.123456789Z",
+                        "urns": [
+                            "tel:+255788555111"
+                        ]
+                    }
+                ]
+            }
+        }
     }
 ]
\ No newline at end of file