Alexander M. Blokh is a Full Professor at the Department of Mathematics at the University of Alabama at Birmingham, AL, USA and the Director of the Math Department Outreach Program. He mostly does research in dynamical systems, but he is also interested in (mainly planar) topology, and in beautiful results and surprising discoveries in general.
Oleksandr M. Sharkovsky, DSc. is the Head of the Department of Dynamical Systems Theory of the Institute of Mathematics at the National Academy of Sciences of Ukraine in Kiev. His research fields include dynamical systems, differential and difference equations, mathematical physics and topology. He is best known for the discovery of the Sharkovsky ordering.