Jack was born and raised in Massachusetts, where he received his Bachelor of Fine Arts degree from The Boston Conservatory. He began his career on stage, starring in the national tour of the musical CATS. His Broadway debut was in the original company of JEROME ROBBINS BROADWAY, followed by roles in A CHORUS LINE, SWEET SMELL OF SUCCESS, and EQUUS, for which he won the Los Angeles Drama Critics prize and a Drama-Logue Award as Best Actor.
He has also appeared in numerous productions, including GREAT EXPECTATIONS, PRIDE & PREJUD,ICE and CAMELOT, and has narrated the Christopher Wheeldon Ballet, "Carnival Of The Animals" for NYCB. Jack has worked with Jonathan Mostow five times, most recently in the Bruce Willis action thriller "The Surrogates", as well as, "Breakdown," "U-571," the FOX Network's pilot "Them" and his cameo in "Terminator 3: Rise of the Machines".
In addition to his film and television work, Jack has also produced several projects, including the play "Arrabal" at the Bi-Annual Ibero American Theatre Festival in Bogota, Colombia, and "Peter & I" by Matte O'Brien and Matt Vinson. He has also created, directed, and produced three benefits under the Voices For Change banner at Ars Nova, for John Kerry's presidential campaign.
He has guest-starred on several television shows, including "Shades Of Blue" opposite Ray Liotta, and is currently shooting the independent feature "Band Night". Jack has also appeared in the Lifetime miniseries "Marilyn", NatGeo's highest rated film, "Killing Kennedy" opposite Rob Lowe and Ginnifer Goodwin, and has completed the features "10,000 Miles", "Julia", "Needlestick", and "Tio Papi".
He has received rave reviews for his roles in "Two Point Oh" Jeff Jackson's new play off Broadway at 59E59th St. in NYC, and as Elliot in the same play.