In his New York period, he published two seminal books on the Hamiltonian chaos: "Physics of Chaos in Hamiltonian Systems" (Imperial College Press, London, 1998) and "Hamiltonian Chaos and Fractional Dynamics" (Oxford University Press, New York, 2005). Zaslavsky was one of the key persons in the theory of dynamical chaos who made important contributions to a variety of other subjects. He authored and coauthored nine books and more than 300 papers in scientific journals. His books and papers influenced and are influencing very much in advancing modern nonlinear science.