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Among the irregular contributors with just a single Mad byline to their credit are Charles M. Schulz, Chevy Chase, " Weird Al " Yankovic, Andy Griffith, Will Eisner, Kevin Smith, J. Fred Muggs, Boris Vallejo, Sir John Tenniel, Jean Shepherd, Winona Ryder, Jimmy Kimmel, Jason Alexander, Walt Kelly, Rep. Barney Frank, Tom Wolfe, Steve Allen, Jim Lee, Jules Feiffer, Donald Knuth and Richard Nixon, who remains the only President credited with " writing " a Mad article.