Before I was with IDSIA in Switzerland and NICTA. My research at RSCS/ANU/NICTA/IDSIA is/was centered around Universal Artificial Intelligence, which is a mathematical top-down approach to AI, based on Kolmogorov complexity, algorithmic probability, universal Solomonoff induction, Occam's razor, Levin search, sequential decision theory, dynamic programming, reinforcement learning, and rational agents. Generally I'm attracted by fundamental problems on the boundary between Science and Philosophy, which have a chance of being solved in my expected lifespan. One is Artificial Intelligence. The other is Particle Physics with questions related to physical Theories of Everything. Mathematics in its whole breadth (statistics, numerics, algebra, ...) has become my constant and cherished companion.