diff --git a/OHIFViewer/client/components/viewer/viewer.js b/OHIFViewer/client/components/viewer/viewer.js
index eb11d1076..4feb6fc91 100644
--- a/OHIFViewer/client/components/viewer/viewer.js
+++ b/OHIFViewer/client/components/viewer/viewer.js
@@ -2,12 +2,41 @@ import { Meteor } from 'meteor/meteor';
 import { Session } from 'meteor/session';
 import { Template } from 'meteor/templating';
 import { ReactiveDict } from 'meteor/reactive-dict';
+import { Tracker } from 'meteor/tracker'
 
 import { OHIF } from 'meteor/ohif:core';
 import 'meteor/ohif:cornerstone';
 import 'meteor/ohif:viewerbase';
 import 'meteor/ohif:metadata';
 
+
+/**
+ * Inits OHIF Hanging Protocol's onReady.
+ * It waits for OHIF Hanging Protocol to be ready to instantiate the ProtocolEngine
+ * Hanging Protocol will use OHIF LayoutManager to render viewports properly
+ */
+const initHangingProtocol = () => {
+    // When Hanging Protocol is ready
+    HP.ProtocolStore.onReady(() => {
+
+        // Gets all StudyMetadata objects: necessary for Hanging Protocol to access study metadata
+        const studyMetadataList = OHIF.viewer.StudyMetadataList.all();
+
+        // Caches Layout Manager: Hanging Protocol uses it for layout management according to current protocol
+        const layoutManager = OHIF.viewerbase.layoutManager;
+
+        // Instantiate StudyMetadataSource: necessary for Hanging Protocol to get study metadata
+        const studyMetadataSource = new OHIFStudyMetadataSource();
+
+        // Creates Protocol Engine object with required arguments
+        const ProtocolEngine = new HP.ProtocolEngine(layoutManager, studyMetadataList, [], studyMetadataSource);
+
+        // Sets up Hanging Protocol engine
+        HP.setEngine(ProtocolEngine);
+
+    });
+};
+
 Meteor.startup(() => {
     Session.setDefault('activeViewport', false);
     Session.setDefault('leftSidebar', false);
@@ -78,12 +107,29 @@ Template.viewer.onCreated(() => {
     instance.data.studies.forEach(study => {
         study.selected = true;
         OHIF.viewer.Studies.insert(study);
+        OHIF.viewer.StudyMetadataList.insert(studyMetadata);
         ViewerData[contentId].studyInstanceUids.push(study.studyInstanceUid);
     });
 
     Session.set('ViewerData', ViewerData);
 });
 
+Template.viewer.onRendered(function() {
+
+    this.autorun(function() {
+        // To make sure ohif viewerMain is rendered before initializing Hanging Protocols
+        const isOHIFViewerMainRendered = Session.get('OHIFViewerMainRendered');
+
+        // To avoid first run
+        if (isOHIFViewerMainRendered) {
+            // To run only when ViewerMainRendered dependency has changed.
+            // because initHangingProtocol can have other reactive components
+            Tracker.nonreactive(initHangingProtocol);
+        }
+    });
+
+});
+
 Template.viewer.events({
     'click .js-toggle-studies'() {
         const instance = Template.instance();
diff --git a/Packages/ohif-study-list/client/lib/OHIFStudyMetadataSource.js b/Packages/ohif-study-list/client/lib/OHIFStudyMetadataSource.js
new file mode 100644
index 000000000..51d08bd10
--- /dev/null
+++ b/Packages/ohif-study-list/client/lib/OHIFStudyMetadataSource.js
@@ -0,0 +1,16 @@
+import { OHIF } from 'meteor/ohif:core';
+import 'meteor/ohif:viewerbase';
+
+export class OHIFStudyMetadataSource extends OHIF.viewerbase.StudyMetadataSource {
+
+    /**
+     * Get study metadata for a study with given study InstanceUID
+     * @param  {String} studyInstanceUID Study InstanceUID
+     */
+    getByInstanceUID(studyInstanceUID) {
+        return new Promise((resolve, reject) => {
+            getStudyMetadata(studyInstanceUID, resolve, reject);
+        });
+    }
+
+}
diff --git a/Packages/ohif-study-list/package.js b/Packages/ohif-study-list/package.js
index a854f9dae..1ec26f1f4 100644
--- a/Packages/ohif-study-list/package.js
+++ b/Packages/ohif-study-list/package.js
@@ -65,4 +65,5 @@ Package.onUse(function(api) {
     // Export the Collections
     api.export('StudyListStudies', 'client');
     api.export('StudyListSelectedStudies', 'client');
+    api.export('OHIFStudyMetadataSource', 'client');
 });
diff --git a/Packages/ohif-viewerbase/client/components/viewer/viewerMain/viewerMain.js b/Packages/ohif-viewerbase/client/components/viewer/viewerMain/viewerMain.js
index dfab3a971..a6486d815 100644
--- a/Packages/ohif-viewerbase/client/components/viewer/viewerMain/viewerMain.js
+++ b/Packages/ohif-viewerbase/client/components/viewer/viewerMain/viewerMain.js
@@ -114,7 +114,11 @@ Template.viewerMain.onRendered(() => {
     // Enable hotkeys
     hotkeyUtils.enableHotkeys();
 
-    Session.set('ViewerMainRendered', Random.id());
+    Session.set('OHIFViewerMainRendered', {
+        instance,
+        date: new Date()
+    });
+
 });
 
 Template.viewerMain.onDestroyed(() => {
diff --git a/Packages/ohif-viewerbase/client/lib/classes/StudyMetadataSource.js b/Packages/ohif-viewerbase/client/lib/classes/StudyMetadataSource.js
index 7ee9518b0..286df0e9b 100644
--- a/Packages/ohif-viewerbase/client/lib/classes/StudyMetadataSource.js
+++ b/Packages/ohif-viewerbase/client/lib/classes/StudyMetadataSource.js
@@ -5,25 +5,25 @@ import { OHIFError } from './OHIFError';
  */
 export class StudyMetadataSource {
 
-  /**
-   * Get study metadata for a given study info
-   * @param  {Object} studyInfo Study info object
-   */
-  getByStudyInfo(studyInfo) {
     /**
-     * Please override this method on a specialized class.
+     * Get study metadata for a given study info
+     * @param  {Object} studyInfo Study info object
      */
-    throw new OHIFError('StudyMetadataSource::getByStudyInfo is not overriden. Please, override it in a specialized class. See OHIFStudyMetadataSource for example');
-  }
+    getByStudyInfo(studyInfo) {
+        /**
+         * Please override this method on a specialized class.
+         */
+        throw new OHIFError('StudyMetadataSource::getByStudyInfo is not overriden. Please, override it in a specialized class. See OHIFStudyMetadataSource for example');
+    }
 
-  /**
-   * Get study metadata for a study with given study InstanceUID
-   * @param  {String} studyInstanceUID Study InstanceUID
-   */
-  getByInstanceUID(studyInstanceUID) {
     /**
-     * Please override this method on a specialized class.
+     * Get study metadata for a study with given study InstanceUID
+     * @param  {String} studyInstanceUID Study InstanceUID
      */
-    throw new OHIFError('StudyMetadataSource::getByInstanceUID is not overriden. Please, override it in a specialized class. See OHIFStudyMetadataSource for example');
-  }
+    getByInstanceUID(studyInstanceUID) {
+        /**
+         * Please override this method on a specialized class.
+         */
+        throw new OHIFError('StudyMetadataSource::getByInstanceUID is not overriden. Please, override it in a specialized class. See OHIFStudyMetadataSource for example');
+    }
 }
\ No newline at end of file