Title: Happy years in Groningen and Rotterdam Speaker: Shuzhong Zhang Dept of Systems Engineering & Engineering Management The Chinese University of Hong Kong Abstract: On the occasion that the optimization community grieves over the sudden loss of a young and extraordinary talent in the field, I shall recall some of the happy moments that Jos and I spent together at Department of Econometrics, University of Groningen (1992 -- 1993), and Econometric Institute, Erasmus University Rotterdam (1993 -- 1997), where he completed his master's thesis and the Ph.D dissertation, respectively, on interior point methods. Some of our joint work during these years helped shaping the foundations of his famous SDP solver, SeDuMi.