After resigning in 1977 and starting a sports management company, Appel joined World Team Tennis to do PR for the New York Apples, featuring Billie Jean King and Vitas Gerulaitis. When the league folded, he joined the staff of Bowie Kuhn. While serving as VP for Public Relations for WPIX, he won an Emmy as the executive producer of Yankee telecasts; he also produced pre-season football telecasts for the New York Giants and New York Jets. Appel has also worked for the Atlanta Committee for the Olympic Games and The Topps Company.
Appel has written 18 books, including a biography of King Kelly, and children's biographies of Yogi Berra and Joe DiMaggio. He ghost-wrote books for Eric Gregg, Larry King, Bowie Kuhn, Lee MacPhail, Thurman Munson, and Tom Seaver, and wrote a biography of Munson published in 2009. His 2012 book, Pinstripe Empire: The New York Yankees from Before the Babe to After the Boss, was the first narrative history of the team since Frank Graham's 1943 publication, The New York Yankees. He has also contributed to a variety of publications, including Sports Collectors Digest, Yankees Magazine and Encyclopedia Americana.
He has served a member of the Board of Directors for the Yogi Berra Museum and is a member of the Board of Trustees of the New York Sports Museum and Hall of Fame and was a member of the Advisory Council to the Israel Baseball League. He also served as Editor-at-Large for the National Baseball Hall of Fame and Museum's quarterly magazine, and helped write the text on the plaques of Hall of Fame inductees.
He is president of Marty Appel Public Relations, New York based PR firm specializing in sports, and is married to Lourdes Appel. He has two children from an earlier marriage.
- Appel PR
- IMDB entry
- SABR interview
- A Life in Pinstripes, Part 1
- A Life in Pinstripes, Part 2
- Marty Appel radio interview Munson WSLR with Doug Miles