sentences:  The PR agency includes as its clients largely ones in the world of sports, but it also has clients in publishing, education, consumer products, medicine, and not-for-profit.Appel has written over 20 books, including a biography of baseball player King Kelly, and children's biographies of Yankees Yogi Berra and Joe DiMaggio.He ghost-wrote auto-biographical books for umpire Eric Gregg, TV and radio talk show host Larry King, baseball commissioner Bowie Kuhn, baseball executive Lee MacPhail, and baseball players Thurman Munson ("Thurman Munson