Hans Renette, a FIDE Master with two International Master norms, is a historian and chess coach. He has written chess biographies of the great players Emanuel Lasker, Henry Edward Bird, Louis Paulsen, Gustav Neumann and John Wisker. Tibor Karolyi is an International Master and chess coach who has written games collections of Magnus Carlsen, Garry Kasparov, Anatoly Karpov, Bobby Fischer, Boris Spassky, Tigran Petrosian and Mikhail Tal, among many other chess books.