I had the chance to work with the following mathematicians: Renato Monteiro (Georgia Tech), Benar Svaiter (IMPA), Anatoli Iouditski (UGA), Arkadi Nemirovski (Georgia Tech), Alexander Shapiro (Georgia Tech), Rene Henrion (WIAS), Werner Romisch (Humboldt University), Volker Kratschmer (Duisburg-Esse University), Claudia Sagastizabal, Jorge Zubelli (IMPA) and the following software engineers: Marc Dutoo, Marc Barret, and Marc Perroud.