You may recognize Zach as the Boss in Fight Club; O’Reilly in Tommy Boy; Eddie, who lost his head in Twister; Carl Webb, the fixer, in the first season of 24, or Andy Cramed, the man who brought the plague to town, in Deadwood. You may also have caught him playing leading roles on ABC’s C16:FBI and the USA Network’s Touching Evil, rising from FBI agent in the former to special unit squad captain in the latter. Currently, he can be seen on the critically and popularly acclaimed CBS series, The Good Wife, as the ethically challenged lawyer David Lee. Zach is also filming J. Edgar, starring Leonardo DiCaprio, directed by Clint Eastwood.

The stage, however, is his first calling. He has performed on the boards from Maine to Alaska. In August of 2008, he appeared as Beethoven in Moisés Kaufman’s 33 Variations at the La Jolla Playhouse. In 2009, the play made the journey to Broadway with Jane Fonda as star. Zach was honored to be included among the production’s numerous Tony nominations. The Broadway production was remounted in Los Angeles, at the Ahmanson Theatre in 2011.

In 2010, he completed a run of the Atlantic Theater Company’s well received production of Moira Buffini’s Gabriel.

Zach is currently having a grand time trading nuances with Frank Langella in the celebrated Roundabout Theatre production of Terrence Rattigan's Man And Boy .