(written from a Production point of view)
Mendillo is engaged to actress Lisa Blake Richards. Beside his on-screen appearances he is also a stage actor.
Among his acting resume are films such as Across 110th Street (1972, with Dick Crockett), Key West (1973), Slap Shot (1977), Teachers (1984, with William Schallert and Richard J. Zobel, Jr.), Without a Trace (1988, with Jacqueline Brookes, Ted Sorel, Thomas Kopache, Bill Smitrovich, Paul Collins, and Terry O'Quinn), Broadcast News (1987), Cobb (1994, with Scott Burkholder, William Utay, George Wilbur, Tom Todoroff, and stunts by Tom Morga and Patricia Tallman), The First Wives Club (1996, with Stephen Collins), G.I. Jane (1997), The Shrink Is In (2001, with David Bowe and Pancho Demmings), Empire Falls (2005), and Last of the Romantics (2007).
Medillo has also appeared in television series such as Serpico (1976, with David Birney), A Man Called Hawk (1989, with Avery Brooks), Law & Order (1991-1997), Son of the Beach (2002, with Lisa Banes), Alias (2002, with Stephen Davies and Terry O'Quinn), and The Practice (2004).