Gonzalo Camarillo leads the Advanced Signalling Research Laboratory of Ericsson in Helsinki, Finland. He is an active participant in the IETF, where he has authored and coauthored several specifications used in the IMS. In particular, he is a co-author of themain SIP specification, RFC 3261. In addition, he co-chairs the IETF SIPPING working group, which handles the requirements from 3GPP and 3GPP2 related to SIP, and the IETF HIP (Host Identity Protocol) working group, which deals with lower-layer mobility and security. He is the Ericsson representative in the SIP Forum and is a regular speaker at different industry conferences. During his stay as a visitor researcher at Columbia University in New York, USA, he published a book entitled “SIP Demystified”. Gonzalo received an M.Sc. degree in Electrical Engineering from Universidad Politecnica de Madrid, Spain, and another M.Sc. degree (also in Electrical Engineering) from the Royal Institute of Technology in Stockholm, Sweden. He is currently continuing his studies as a Ph.D. candidate at Helsinki University of Technology, in Finland.

Miguel A. García-Martín is a Principal Research Engineer in the Networking Technologies Laboratory of the Nokia Research Center in Helsinki, Finland. Before joining Nokia Miguel was working for Ericsson in Spain, and then Ericsson in Finland. Miguel is an active participant of the IETF, and for a number of years has been a key contributor in 3GPP. Lately Miguel has also been participating in the specification of NGN in ETSI. In the IETF, he has authored and co-authored several specifications related to the IMS. In 3GPP, he has been a key contributor to the development of the IMS standard. Miguel is also a regular speaker at different industry conferences. Miguel received a B. Eng. degree in Telecommunications Engineering from Universidad de Valladolid, Spain.