In 2009, Mark Stewart completed his 30th book in the "Team Spirit" series for Norwood House Press. Each book covers the players, history and culture of a major league baseball team. The series was written in collaboration with James L. Gates, Jr., Library Director at the National Baseball Hall of Fame. The books are all licensed by Major League Baseball. Stewart is a co-creator of the sports information web site JockBio.com, which features full-length biographies on more than 250 current athletes, as well as former baseball, football and basketball stars.