diff --git a/ghost/admin/app/controllers/member.js b/ghost/admin/app/controllers/member.js
index 8348e9fc62..599faae44b 100644
--- a/ghost/admin/app/controllers/member.js
+++ b/ghost/admin/app/controllers/member.js
@@ -25,7 +25,7 @@ export default Controller.extend({
         setProperty(propKey, value) {
             this._saveMemberProperty(propKey, value);
         },
-        toggleDeleteTagModal() {
+        toggleDeleteMemberModal() {
             this.toggleProperty('showDeleteMemberModal');
         },
         finaliseDeletion() {
@@ -35,6 +35,44 @@ export default Controller.extend({
                 this.members.decrementProperty('meta.pagination.total');
             }
             this.router.transitionTo('members');
+        },
+
+        toggleUnsavedChangesModal(transition) {
+            let leaveTransition = this.leaveScreenTransition;
+    
+            if (!transition && this.showUnsavedChangesModal) {
+                this.set('leaveScreenTransition', null);
+                this.set('showUnsavedChangesModal', false);
+                return;
+            }
+    
+            if (!leaveTransition || transition.targetName === leaveTransition.targetName) {
+                this.set('leaveScreenTransition', transition);
+    
+                // if a save is running, wait for it to finish then transition
+                if (this.save.isRunning) {
+                    return this.save.last.then(() => {
+                        transition.retry();
+                    });
+                }
+    
+                // we genuinely have unsaved data, show the modal
+                this.set('showUnsavedChangesModal', true);
+            }
+        },
+
+        leaveScreen() {
+            let transition = this.leaveScreenTransition;
+
+            if (!transition) {
+                this.notifications.showAlert('Sorry, there was an error in the application. Please let the Ghost team know what happened.', {type: 'error'});
+                return;
+            }
+
+            // roll back changes on model props
+            this.member.rollbackAttributes();
+
+            return transition.retry();
         }
     },
 
diff --git a/ghost/admin/app/routes/member.js b/ghost/admin/app/routes/member.js
index 028bf8b66a..97e474af9b 100644
--- a/ghost/admin/app/routes/member.js
+++ b/ghost/admin/app/routes/member.js
@@ -1,6 +1,24 @@
 import AuthenticatedRoute from 'ghost-admin/routes/authenticated';
+import CurrentUserSettings from 'ghost-admin/mixins/current-user-settings';
+import {inject as service} from '@ember/service';
+
+export default AuthenticatedRoute.extend(CurrentUserSettings, {
+
+    router: service(),
+
+    init() {
+        this._super(...arguments);
+        this.router.on('routeWillChange', (transition) => {
+            this.showUnsavedChangesModal(transition);
+        });
+    },
+
+    beforeModel() {
+        this._super(...arguments);
+        return this.get('session.user')
+            .then(this.transitionAuthor());
+    },
 
-export default AuthenticatedRoute.extend({
     model(params) {
         this._isMemberUpdated = true;
         return this.store.findRecord('member', params.member_id, {
@@ -19,10 +37,31 @@ export default AuthenticatedRoute.extend({
         this._super(...arguments);
 
         // clear the properties
+        let {controller} = this;
+        controller.model.rollbackAttributes();
+        this.set('controller.model', null);
         this._isMemberUpdated = false;
     },
 
+    actions: {
+        save() {
+            this.controller.send('save');
+        }
+    },
+
     titleToken() {
         return this.controller.get('member.name');
+    },
+
+    showUnsavedChangesModal(transition) {
+        if (transition.from && transition.from.name.match(/^member$/) && transition.targetName) {
+            let {controller} = this;
+
+            if (!controller.member.isDeleted && controller.member.hasDirtyAttributes) {
+                transition.abort();
+                controller.send('toggleUnsavedChangesModal', transition);
+                return;
+            }
+        }
     }
 });
diff --git a/ghost/admin/app/templates/member.hbs b/ghost/admin/app/templates/member.hbs
index a8210781ef..9f898cfc9b 100644
--- a/ghost/admin/app/templates/member.hbs
+++ b/ghost/admin/app/templates/member.hbs
@@ -31,7 +31,7 @@
         {{gh-member-settings-form member=member
             setProperty=(action "setProperty")
             isLoading=this.isLoading
-            showDeleteTagModal=(action "toggleDeleteTagModal")}}
+            showDeleteTagModal=(action "toggleDeleteMemberModal")}}
     </form>
         <button
             type="button"
@@ -43,6 +43,13 @@
         </button>
 </section>
 
+{{#if showUnsavedChangesModal}}
+    {{gh-fullscreen-modal "leave-settings"
+        confirm=(action "leaveScreen")
+        close=(action "toggleUnsavedChangesModal")
+        modifier="action wide"}}
+{{/if}}
+
 {{#if showDeleteMemberModal}}
     {{gh-fullscreen-modal "delete-member"
         model=(hash member=member onSuccess=(action "finaliseDeletion"))