Sang and played bass for a Chicago-area rock band called the Apochryphals from 1964 to '69
Met his wife, Arlene, in high school; both appeared in a touring company of Hair in 1969, which was Mantegna's professional stage debut
In 1978, while with Chicago's Organic Theater Company, cowrote Bleacher Bums, which later played off-Broadway and was adapted for television by the Chicago PBS station (it won a local Emmy)
Has appeared in six plays and movies written by fellow Chicagoan David Mamet, most notably Glengarry Glen Ross, for which he won a Tony
Has set a record for guest appearances on The Simpsons, as Springfield mob chieftain Fat Tony
Joined Criminal Minds at the beginning of the show's third season to replace departing star Mandy Patinkin
Daughter Gia was Miss Golden Globe 2011
Awards
2007Emmy-Outstanding Supporting Actor in a Miniseries or a Movie:nominated
1999Emmy-Outstanding Supporting Actor in a Miniseries or a Movie:nominated
1997Emmy-Outstanding Supporting Actor in a Miniseries or Special:nominated