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Henry Sinnreich has held various engineering and executive positions at MCI and has been involved in Internet and multimedia services for over 10 years, including the development of the MCI flagship MCI Advantage service based on SIP. Previous work at MCI includes microwave radio, lightwave engineering, digital cross-connects, laboratory testing, long distance telephony switching, frame relay, SMDS, and web based IT systems.

He drove the upgrade by MCI of the NSF IP network, the first IP Gigabit trial network in the N.E. USA Corridor, RSVP validation on the IP wide area network and support for the global internetMCI IP service.

Henry Sinnreich is also a contributor to the SIP and multimedia related working groups in the IETF.

Henry Sinnreich has been awarded the title of Pioneer for VoIP in 2000 at the VON conference in Stockholm, Sweden and is a co-founder and former member of the board of the International SIP Forum. Henry Sinnreich is a member of the IEEE and ACM and is also a frequent speaker and lecturer on Internet communications; he has a number of publications on this topic and has co-authored the books Internet Communications Using SIP and SIP Beyond VoIP.