Jon Peterson is Sr. Technical Industry Liaison at NeuStar, Inc. Jon previously worked at Level(3) Communications on SIP architecture and softswitch technology. Jon has done extensive work on real-time communications in various standards bodies, especially the IETF, where Jon co-chairs the SIMPLE (SIP for Instant Messaging and Presence Leveraging Extensions) working group. Jon has authored or co-authored several RFCs; he is co-author of RFC3261 which defines SIP (the Session Initiation Protocol).