Henning Schulzrinne, Levi Professor in the Department of Computer Science at Columbia University, New York. PhD from the University of Massachusetts; worked at Bell Laboratories, Murray Hill and GMD Fokus, Berlin. Former CTO at the Federal Communications Commission. Research interests: Internet multimedia and telephony services, signaling, network quality of service, scheduling, multicast, performance evaluation. Co-author of the Internet standards-track protocols RTP, RTSP, SIP, GIST and LoST.