diff --git a/src/component-index.js b/src/component-index.js
index 50a02e0862..bc3d698cac 100644
--- a/src/component-index.js
+++ b/src/component-index.js
@@ -105,6 +105,8 @@ import views$elements$EditableTextContainer from './components/views/elements/Ed
 views$elements$EditableTextContainer && (module.exports.components['views.elements.EditableTextContainer'] = views$elements$EditableTextContainer);
 import views$elements$EmojiText from './components/views/elements/EmojiText';
 views$elements$EmojiText && (module.exports.components['views.elements.EmojiText'] = views$elements$EmojiText);
+import views$elements$MemberEventListSummary from './components/views/elements/MemberEventListSummary';
+views$elements$MemberEventListSummary && (module.exports.components['views.elements.MemberEventListSummary'] = views$elements$MemberEventListSummary);
 import views$elements$PowerSelector from './components/views/elements/PowerSelector';
 views$elements$PowerSelector && (module.exports.components['views.elements.PowerSelector'] = views$elements$PowerSelector);
 import views$elements$ProgressBar from './components/views/elements/ProgressBar';
diff --git a/src/components/structures/MessagePanel.js b/src/components/structures/MessagePanel.js
index 31ef15b6dc..298372a4d8 100644
--- a/src/components/structures/MessagePanel.js
+++ b/src/components/structures/MessagePanel.js
@@ -229,6 +229,7 @@ module.exports = React.createClass({
 
     _getEventTiles: function() {
         var EventTile = sdk.getComponent('rooms.EventTile');
+        const MemberEventListSummary = sdk.getComponent('views.elements.MemberEventListSummary');
 
         this.eventNodes = {};
 
@@ -275,6 +276,11 @@ module.exports = React.createClass({
             this.currentGhostEventId = null;
         }
 
+        var isMembershipChange = (e) =>
+            e.getType() === 'm.room.member'
+            && ['join', 'leave'].indexOf(e.event.content.membership) !== -1
+            && (!e.event.prev_content || e.event.content.membership  !== e.event.prev_content.membership);
+
         for (i = 0; i < this.props.events.length; i++) {
             var mxEv = this.props.events[i];
             var wantTile = true;
@@ -286,6 +292,42 @@ module.exports = React.createClass({
 
             var last = (i == lastShownEventIndex);
 
+            // Wrap consecutive member events in a ListSummary
+            if (isMembershipChange(mxEv)) {
+                let summarisedEvents = [mxEv];
+                i++;
+                for (;i < this.props.events.length; i++) {
+                    let collapsedMxEv = this.props.events[i];
+
+                    if (!isMembershipChange(collapsedMxEv)) {
+                        i--;
+                        break;
+                    }
+                    summarisedEvents.push(collapsedMxEv);
+                }
+                // At this point, i = this.props.events.length OR i = the index of the last
+                // MembershipChange in a sequence of MembershipChanges
+
+                let eventTiles = summarisedEvents.map(
+                    (e) => {
+                        let ret = this._getTilesForEvent(prevEvent, e);
+                        prevEvent = e;
+                        return ret;
+                    }
+                ).reduce((a,b) => a.concat(b));
+
+                if (eventTiles.length === 0) {
+                    eventTiles = null;
+                }
+
+                ret.push(
+                    <MemberEventListSummary events={summarisedEvents}>
+                        {eventTiles}
+                    </MemberEventListSummary>
+                );
+                continue;
+            }
+
             if (wantTile) {
                 // make sure we unpack the array returned by _getTilesForEvent,
                 // otherwise react will auto-generate keys and we will end up
diff --git a/src/components/views/avatars/MemberAvatar.js b/src/components/views/avatars/MemberAvatar.js
index 6e1670604e..7f9630d416 100644
--- a/src/components/views/avatars/MemberAvatar.js
+++ b/src/components/views/avatars/MemberAvatar.js
@@ -19,6 +19,7 @@ limitations under the License.
 var React = require('react');
 var Avatar = require('../../../Avatar');
 var sdk = require("../../../index");
+const dispatcher = require("../../../dispatcher");
 
 module.exports = React.createClass({
     displayName: 'MemberAvatar',
@@ -27,14 +28,19 @@ module.exports = React.createClass({
         member: React.PropTypes.object.isRequired,
         width: React.PropTypes.number,
         height: React.PropTypes.number,
-        resizeMethod: React.PropTypes.string
+        resizeMethod: React.PropTypes.string,
+        // The onClick to give the avatar
+        onClick: React.PropTypes.function,
+        // Whether the onClick of the avatar should be overriden to dispatch 'view_user'
+        viewUserOnClick: React.PropTypes.boolean,
     },
 
     getDefaultProps: function() {
         return {
             width: 40,
             height: 40,
-            resizeMethod: 'crop'
+            resizeMethod: 'crop',
+            viewUserOnClick: false,
         }
     },
 
@@ -63,11 +69,20 @@ module.exports = React.createClass({
     render: function() {
         var BaseAvatar = sdk.getComponent("avatars.BaseAvatar");
 
-        var {member, ...otherProps} = this.props;
+        var {member, onClick, ...otherProps} = this.props;
+
+        if (this.props.viewUserOnClick) {
+            onClick = () => {
+                dispatcher.dispatch({
+                    action: 'view_user',
+                    member: this.props.member,
+                });
+            }
+        }
 
         return (
             <BaseAvatar {...otherProps} name={this.state.name} title={this.state.title}
-                idName={member.userId} url={this.state.imageUrl} />
+                idName={member.userId} url={this.state.imageUrl} onClick={onClick}/>
         );
     }
 });
diff --git a/src/components/views/elements/MemberEventListSummary.js b/src/components/views/elements/MemberEventListSummary.js
new file mode 100644
index 0000000000..f50f56ffb4
--- /dev/null
+++ b/src/components/views/elements/MemberEventListSummary.js
@@ -0,0 +1,212 @@
+/*
+Copyright 2016 OpenMarket Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+import React from 'react';
+const MemberAvatar = require('../avatars/MemberAvatar.js');
+
+module.exports = React.createClass({
+    displayName: 'MemberEventListSummary',
+
+    propTypes: {
+        // An array of member events to summarise
+        events: React.PropTypes.array.isRequired,
+        // An array of EventTiles to render when expanded
+        children: React.PropTypes.array.isRequired,
+        // The maximum number of names to show in either the join or leave summaries
+        summaryLength: React.PropTypes.number,
+        // The maximum number of avatars to display in the summary
+        avatarsMaxLength: React.PropTypes.number,
+        // The minimum number of events needed to trigger summarisation
+        threshold: React.PropTypes.number,
+    },
+
+    getInitialState: function() {
+        return {
+            expanded: false,
+        };
+    },
+
+    getDefaultProps: function() {
+        return {
+            summaryLength: 3,
+            threshold: 3,
+            avatarsMaxLength: 5
+        };
+    },
+
+    _toggleSummary: function() {
+        this.setState({
+            expanded: !this.state.expanded,
+        });
+    },
+
+    _getEventSenderName: function(ev) {
+        if (!ev) {
+            return 'undefined';
+        }
+        return ev.sender.name || ev.event.content.displayname || ev.getSender();
+    },
+
+    _renderNameList: function(events) {
+        if (events.length === 0) {
+            return null;
+        }
+        let originalNumber = events.length;
+        events = events.slice(0, this.props.summaryLength);
+        let lastEvent = events.pop();
+
+        let names = events.map((ev) => {
+            return this._getEventSenderName(ev);
+        }).join(', ');
+
+        let lastName = this._getEventSenderName(lastEvent);
+        if (names.length === 0) {
+            // special-case for a single event
+            return lastName;
+        }
+
+        let remaining = originalNumber - this.props.summaryLength;
+        if (remaining > 0) {
+            //  name1, name2, name3, and 100 others
+            return names + ', ' + lastName + ', and ' + remaining + ' others';
+        } else {
+            //  name1, name2 and name3
+            return names + ' and ' + lastName;
+        }
+    },
+
+    _renderSummary: function(joinEvents, leaveEvents) {
+        let joiners = this._renderNameList(joinEvents);
+        let leavers = this._renderNameList(leaveEvents);
+
+        let joinSummary = null;
+        if (joiners) {
+            joinSummary = (
+                <span>
+                    {joiners} joined the room
+                </span>
+            );
+        }
+        let leaveSummary = null;
+        if (leavers) {
+            leaveSummary = (
+                <span>
+                    {leavers} left the room
+                </span>
+            );
+        }
+        return (
+            <span>
+                {joinSummary}{joinSummary && leaveSummary?'; ':''}
+                {leaveSummary}
+            </span>
+        );
+    },
+
+    _renderAvatars: function(events) {
+        let avatars = events.slice(0, this.props.avatarsMaxLength).map((e) => {
+            return (
+                <MemberAvatar
+                    key={e.getId()}
+                    member={e.sender}
+                    width={14}
+                    height={14}
+                />
+            );
+        });
+
+        return (
+            <span>
+                {avatars}
+            </span>
+        );
+    },
+
+    render: function() {
+        let summary = null;
+
+        // Reorder events so that joins come before leaves
+        let eventsToRender = this.props.events;
+
+        // Filter out those who joined, then left
+        let filteredEvents = eventsToRender.filter(
+            (e) => {
+                return eventsToRender.filter(
+                    (e2) => {
+                        return e.getSender() === e2.getSender()
+                            && e.event.content.membership !== e2.event.content.membership;
+                    }
+                ).length === 0;
+            }
+        );
+
+        let joinAndLeft = (eventsToRender.length - filteredEvents.length) / 2;
+        if (joinAndLeft <= 0 || joinAndLeft % 1 !== 0) {
+            joinAndLeft = null;
+        }
+
+        let joinEvents = filteredEvents.filter((ev) => {
+            return ev.event.content.membership === 'join';
+        });
+
+        let leaveEvents = filteredEvents.filter((ev) => {
+            return ev.event.content.membership === 'leave';
+        });
+
+        let fewEvents = eventsToRender.length < this.props.threshold;
+        let expanded = this.state.expanded || fewEvents;
+        let expandedEvents = null;
+
+        if (expanded) {
+            expandedEvents = this.props.children;
+        }
+
+        let avatars = this._renderAvatars(joinEvents.concat(leaveEvents));
+
+        let toggleButton = null;
+        let summaryContainer = null;
+        if (!fewEvents) {
+            summary = this._renderSummary(joinEvents, leaveEvents);
+            toggleButton = (
+                <a className="mx_MemberEventListSummary_toggle" onClick={this._toggleSummary}>
+                    {expanded ? 'collapse' : 'expand'}
+                </a>
+            );
+            let plural = (joinEvents.length + leaveEvents.length > 0) ? 'others' : 'users';
+            let noun = (joinAndLeft === 1 ? 'user' : plural);
+
+            summaryContainer = (
+                <div className="mx_EventTile_line">
+                    <div className="mx_EventTile_info">
+                        <span className="mx_MemberEventListSummary_avatars">
+                            {avatars}
+                        </span>
+                        <span className="mx_TextualEvent mx_MemberEventListSummary_summary">
+                            {summary}{joinAndLeft? '. ' + joinAndLeft + ' ' + noun + ' joined and left' : ''}
+                        </span>&nbsp;
+                        {toggleButton}
+                    </div>
+                </div>
+            );
+        }
+
+        return (
+            <div className="mx_MemberEventListSummary">
+                {summaryContainer}
+                {expandedEvents}
+            </div>
+        );
+    },
+});
diff --git a/src/components/views/rooms/EventTile.js b/src/components/views/rooms/EventTile.js
index fb97d863cd..f4167b32f6 100644
--- a/src/components/views/rooms/EventTile.js
+++ b/src/components/views/rooms/EventTile.js
@@ -348,13 +348,6 @@ module.exports = React.createClass({
         </span>;
     },
 
-    onMemberAvatarClick: function(event) {
-        dispatcher.dispatch({
-            action: 'view_user',
-            member: this.props.mxEvent.sender,
-        });
-    },
-
     onSenderProfileClick: function(event) {
         var mxEvent = this.props.mxEvent;
         dispatcher.dispatch({
@@ -443,7 +436,7 @@ module.exports = React.createClass({
                     <div className="mx_EventTile_avatar">
                         <MemberAvatar member={this.props.mxEvent.sender}
                             width={avatarSize} height={avatarSize}
-                            onClick={ this.onMemberAvatarClick }
+                            viewUserOnClick={true}
                         />
                     </div>
             );