Nebojsa Nakicenovic, born in 1949 in Austria, studied economics and computer science at Princeton University, New Jersey, USA, and completed his Ph.D. at the University of Vienna, Austria. In 1973 he joined the International Institute for Applied Systems Analysis near Vienna to conduct studies on long-term, global energy prospects and on the restructuring of the global automotive industry. Later he led programs on the dynamics of technological and social change and environmentally compatible energy strategies. Professor Nakicenovic is currently head of the energy economics group at the Vienna University of Technology and leader of the Transitions to new Technologies Project. His research focuses on the diffusion of new technologies and their interactions with the environment.