Dillon was born on Aug. 18, 1965; one of five children (four brothers and a sister) born to Paul Dillon, a painter and sales manager, and his wife Mary Ellen of Mamaroneck, NY. Though his initial interest was commercial art – he had studied at the School of Visual Arts in New York – Dillon dabbled in acting while in high school, and found himself following in his brother’s footsteps after a meeting with an agent tied to Matt’s first big flick, “Tex” (1982). He made his debut with the 1983 TV movie “No Big Deal,” in which he played a troubled juvenile offender who resists attempts to socialize him at a new school. The role set the pace for many of his subsequent projects; he was the resident loudmouth at a tough Catholic school in the 1950s comedy-drama “Heaven Help Us” (1985), and took over the Steve McQueen role in Chuck Russell’s likable remake of “The Blob” (1988). Oliver Stone’s “Platoon” (1985) gave Dillon a chance to dig deeper as Bunny, a gun-happy soldier in Vietnam whose amoral side emerges in a tragic village invasion. Dillon also proved a capable dramatic actor in features like Franc Roddam’s “War Party” (1988), starring as a young Native American involved in a bloody re-enactment of a cavalry attack, and “Immediate Family” (1989), as a teenaged father-to-be, which earned him a Young Artists Award nomination.

Already in his late twenties by the early 1990s, Dillon had not repeated his brother’s rapid ascent to stardom as a young actor, but that did not halt his output, nor impede his will to succeed on his own merit. He was featured in a series of worthy showcases in the early years of the decade, including that of drummer John Densmore in Oliver Stone’s overblown biopic “The Doors” (1992); a tough World War II soldier in “A Midnight Clear” (1992); and Sean Flynn, the doomed, devil-may-care photographer son of Errol Flynn in the TV-movie “Frankie’s House” (1992). The quality projects began drying up by the middle of the 1990s, with Dillon’s performances largely relegated to video store customers – such as with 1996’s “True Crime.” TV did not treat him much better at this time, as when he was miscast as James Fenimore Cooper’s hero Hawkeye in a miniseries version of “The Pathfinder,” (1996), but Dillon did do fine work as a thoughtful Gulf War vet in the gruesome “Stag” (1997) and a husband accused of murdering his own daughter in the miniseries, “Gone in the Night” (1997).

It was becoming apparent that television seemed to be where the work was for Dillon, and episodic series were the next logical step for the actor. After auditioning for the role of Danny Sorenson on “NYPD Blue (ABC, 1993-2005) – a part landed by former child star Rick Schroeder – he had a recurring part on the series as a police officer. More guest shots followed, with roles on the short-lived series “Karen Sisco” (ABC, 2003) and the colossal hit, “24” (Fox, 2001- ), as did a short stint as a series regular on “That’s Life” (CBS, 2000-02). But things were about to change overnight for the actor best known as Matt’s younger brother.

In 2004, Dillon was cast as Johnny “Drama” Chase, the older brother to box office champ Vincent Chase (Adrian Grenier) on the HBO comedy-drama “Entourage,” executive-produced by rapper-turned-A-list Actor, Mark Wahlberg. A C-list actor with a long string of bit parts to his name – most notably an absurd action series called “Viking Quest” – Drama serves mainly as cook, fitness instructor, and comic foil to Chase and his pals – in short, a bit of a buffoon, but Dillon wisely found the character’s heart and played him as slightly wounded and hopeful, even in the most ridiculous of story arcs. By the third season, Drama’s career took an upswing with a part on an Edward Burns-produced television series and a role in Vincent’s epic, “Medellin.” He even found a fan base in France, of all places, which apparently never lost its devotion to the “Viking Quest” series. Dillon was frequently singled out as one of the show’s high points, and received nominations from most of the major TV awards, including an Emmy nod in 2007, a Screen Actors Guild nomination in 2007 and 2008, and a Golden Globe nom in 2008, which he lost to fellow co-star, Jeremy Piven.

The success of “Entourage” also gave Dillon’s film career a boost, as he was given a supporting turn as a hapless gambler in “Poseidon” (2006) and was top-billed in the broad comedy, “The Foursome” (2006). Things in his personal life took off like gangbusters as well. In April 2006, Dillon married actress Jane Stuart in Las Vegas, with his “Entourage co-stars Kevin Connolly and Jerry Ferrara in attendance. Stuart gave birth to their daughter, Ava, a month later; Dillon also had a 15-year-old daughter from a previous relationship.