A native of Long Island, New York, Marc practiced law at one of Boston's most prestigious firms for over four years before leaving to pursue his dream of writing professionally. That legal experience led to a staff position on David E. Kelley's Emmy-winning show about Boston attorneys, The Practice. That same year, he sold his screenplay, Musical Chairs, to Sid Sheinberg's The Bubble Factory.
These opportunities led to an invitation to join the writing staff of Law & Order, where he wrote for three seasons before moving on to the critically-acclaimed series Jack & Bobby, and later, the ratings juggernaut CSI: Miami. It was Jack & Bobby that introduced Marc to Greg Berlanti and the two resolved to create a show together, a pact which led to the development of Eli Stone, for which they received a Writers Guild Award nomination for Best Drama Teleplay.
While writing and producing the Eli pilot, Greg pulled Marc in to help him produce the first season of Brothers & Sisters, which has become a Top-20 hit for ABC. (Marc has also written on L.A. Dragnet and In Justice for ABC.) In addition their work executive producing and writing the second season of Eli Stone, Marc continues to collaborate with Greg as a co-writer on Warner Bros.' feature film version of Green Lantern directed by Martin Campbell and currently in production for a Summer 2011 release.
While maintaining a successful career in television, Marc simultaneously pursued other creative avenues. A life-long comic book fan, he has been writing comics professionally since 2005, beginning with a two-issue stint on DC Comics' Aquaman, which he parlayed into two critically-acclaimed runs on Marvel Comics' premier super-hero, Wolverine. In November 2007, Marc launched his first creator-owned series with Oni Press, entitled Resurrection.
Marc's other comic book credits include Amazing Spider-Man, Young X-Men, Supreme Power, Superman/Batman, The Flash, Blade, Battlestar Galactica and Super Zombies.
In addition to television, film and comic books, Marc is continually exploring other mediums. He's written the scripts for numerous videogames, including Perfect Dark Zero, Call of Duty 3 and X-Men Origins: Wolverine (which was nominated for a WGA Award). In 2008, he adapted a Stephen King short story -- N. -- into a 25-part mobisode series that was available online and through iTunes. It was recently published as a graphic novel by Marvel Comics.
Marc is currently dividing his time between consulting on the new ABC series No Ordinary Family and writing three more films for Warner Bros., The Flash, Arabian Knights and Leonardo Da Vinci & the Soldiers of Forever.
Marc currently lives in Los Angeles with his wife Tara (a fellow TV writer and WGA nominee, who is co-creator of the CW dramedy Reaper), their daughters Lily and Sara, and their cat Rocky.