I am working on pointwise questions in dynamical systems and ergodic theory. This is quite a large field which connects several mathematical research areas, such as Probability, Harmonic Analysis, and Operator theory. Such questions naturally arise in research areas such as return times phenomena and non-conventional ergodic averages, H. Furstenberg and T. Gowers. I solved several important problems and raised others. I have also organized an Ergodic Theory and Dynamical Systems workshop on a yearly basis with NSF support since the summer 2002. Young researchers as well as topnotch researchers have been collaborating as evidenced by several published proceedings of these workshops.