Gérard Verfaillie graduated from École Polytechnique (Paris) in 1971 and from SUPAÉRO (École Nationale Supérieure de l'Aéronautique et de l'Espace, French national engineering school in aeronautics and space, computer science specialization) in 1985. Since 1986, he has been working as a research engineer at ONERA (Office National d'Études et de Recherches Aérospatiales, French government aerospace research center), in the computer science department, and then in the automatic control department. He has been working from 2003 to 2005 as a research supervisor at LAAS/CNRS (Laboratoire d'Analyse et d'Architecture des Systèmes, Centre national de la recherche Scientifique, Systems analysis and architecture laboratory, French national research center). His research activity is related to models, methods, and tools for combinatorial optimization and constrained optimization, especially for planning and decision-making. They take place at the crossing between Operations Research and Artificial Intelligence. He carried out studies for CNES (Centre National d'Études Spatiales, French space agency), ESA (European Space Agency), Astrium or Airbus. He has been entitled to supervise academic research since 1997 and teacher at SUPAÉRO since 1998. Michel Lemaître is a research engineer, graduated from ENSEEIHT (Ecole Nationale Supérieure d'Electrotechnique, d'Electronique, d'Informatique, d'Hydraulique et des Télécommunications, Toulouse, France) in 1972. He completed a PhD degree in 1975 at LAAS/CNRS (Laboratoire d'Analyse et d'Architecture des Systèmes, Toulouse, France). From 1976 he worked at ONERA in Data Bases, Software Engineering and Reactive Systems. Since 1996, his current research interests include Constraint Programming, Algorithmics, and Decision Theory. He was involved in several studies with CNES (Centre National d'Études Spatiales) concerning mission planning and scheduling for Earth Observation Satellites (SPOT and Pléiades systems). He is currently involved in a joint ONERA/CNES research program on autonomy in space, and supervises a PhD student on fair allocation of satellite resources. He teaches at SUPAERO (École Nationale Supérieure de l'Aéronautique et de l'Espace).