Celebrities who had cameos on 'Seinfeld
George Steinbrenner - Wikipedia
Arli$, Official Website for the HBO Series
Yankees' George Steinbrenner wasn't a fan of 'Seinfeld,' according to Mets' Buck Showalter
Seinfeld: Every Episode Larry David Appeared In
George Steinbrenner: SI's coverage of The Boss since 1973 - Sports Illustrated
The 15 Best Non-George Steinbrenner Cameos on 'Seinfeld' by Larry David
Buck Showalter on Seinfeld cameo, cotton uniforms - Sports Illustrated
Damn Yankees!: The Most Memorable Appearances by NY Yankee Players on Seinfeld, News, Scores, Highlights, Stats, and Rumors
Mets manager Buck Showalter says he has a problem with his 1994 'Seinfeld' cameo