Nicolas Montavont is an associate professor at Telecom Bretagne, in the “Réseau, Sécurité et Multimedia” department since 2005. He received the M.Sc. degree, and PhD degree in Computer science from the University of Strasbourg, France, in 2001 and 2004 respectively. He also did a post-doc at National institute of Standard and Technologies (NIST) in Gaithersburg, USA. His research topics during these first years of research were mobility and multihoming management in IPv6 networks. He chaired the Mobile Node with Multiple Interfaces (Monami6) working group at the IETF from 2005 a 2007 and contributed to several standards, with a strong experience in horizontal and vertical handovers. Dr. Nicolas Montavont participated to several national (Cyberté, Remora) projects, as well as European projects (Anemone, Sail). From 2007, Dr. Nicolas Montavont chaired an internal working group at Telecom Bretagne to work on energy efficiency in communication networks. His research topics evolve toward sensors network, smart grids and green communication infrastructure and protocols. His is currently involved in three main projects: interface and network selection algorithm, relaying in ad hoc networking for green and efficient communication and monitoring and control system for building energy consumption.