Manuel Sierra-Perez received the engineer degree from the Universidad PolitÃ©cnica de Madrid (UPM) in 1975 and the Ph.D. degree in 1980 from the same university. Since 1990 he is full professor at the Department of Signal, Systems and Radio communications (SSR) of the UPM. He is teaching undergraduate courses on Antenna Design, Basic Elctromagnetics and Radio electronics. He has directed a large number of research projects in the design and development of microwave receiver and antenna subsystems, and has worked on microwave low-noise amplifiers, radio astronomy receivers, radiometer and communication antennas and passive microwave circuits. His main interest is now in passive and active antenna arrays and in adaptive antennas. He has been working as invited professor in the National Radio-Astronomy Laboratory at Charlottesville (VA) in 1981-1982, and in the University of Colorado at Boulder as visiting professor in 1995-1996. He is senior member of IEEE, member of the Spain Section committee, member of the Spain URSI committee and Spanish delegate in the European Association on Antennas and Propagation (EurAAP).