- His mother Kitty performed with the Ringling Bros. Circus and also appeared many times on the Ed Sullivan Show (The Ed Sullivan Show (1948)) as a member of her family's famous "Colleanos" circus act. She juggled Indian clubs and had a center ring rope act.
- Artistic Director of The New American Theatre, a Los Angeles based Theatre company.
- Nephew of Con Colleano, who is in the Guinness Book of World Records for being the first wire walker to do a forward somersault on the wire.
- Graduate of The Juilliard School
- Played baseball in high school and college
- He is featured in an Al Hirschfeld drawing dueling with Kevin Kline in the 1984 production of Henry V at the Public Theatre in New York.
- Is primarily of Irish, Alsatian, and Australian Aboriginal heritage.
- His father played minor league baseball.
- Featured in Steven Berkoff's book about New York's Public Theater production of Richard II. The book is called Richard II in New York. Jack played "Thomas Mowbray" opposite Andre Braugher's "Bolingbroke".
- Nephew of Bonar Colleano
- Cousin of actor Mark Colleano
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