Prof. em. Dr. Armin Gruen is, since 1984, professor and head of the Chair of photogrammetry at the Institute of Geodesy and Photogrammetry (IGP), Federal Institute of Technology (ETH) Zurich, Switzerland. Since 1 August 2009, he is retired and is now with the Chair of Information Architecture, ETH Zurich Faculty of Architecture. He is currently acting as a principal investigator on the Simulation Platform of the SEC-FCL in Singapore.