 He has written books centered on snowboarding, dirt bike racing, volleyball, golf and many other sports, in addition to a number of biographies of sportsmen and women.His first children's sports book published was "The Lucky Baseball Bat", a 123-page novel published with illustrations by Robert Henneberger by Little, Brown of Boston in 1954.When asked why he wrote sports books for children, Christopher once responded, "Sports have made it possible for me to meet many new people with all sorts of life stories, on and off the field, and these are grist for this writer's mill."