Despite his character being killed off in the first season, Harold returned for a guest appearance in the second season of the show in the episode "Put the Damage On" and the executive producer of the show, Kevin Murphy, stated that he plans to bring the character back in season 3 as well if the show gets renewed.
In January and February 2010, Harold performed alongside Denise Crosby (Star Trek: The Next Generation) and ex-model Claudia Mason in Tennessee Williams' Orpheus Descending at Theater/Theatre in Los Angeles.
The production and cast received mostly positive reviews, with the Los Angeles Times calling his performance "brilliant" and adding "Harold, ideally cast, beautifully ignites with Crosby, whose unconventional interpretation is an affecting revelation." The series concluded its season with Harold's character involved in a affair with the show's lead character Marti (played by Aly Michalka).
During the summer-hiatus from Queer as Folk (between seasons one and two) Harold made his New York theatrical debut playing Josh in Uncle Bob along with George Morfogen.
The role of Josh was difficult and very different from the one he was playing in Queer as Folk.
Because Harold's parents were devout Pentecostals, he had strict religious upbringing. Following graduation from The Lovett School, Harold attended American University in Washington, DC, on a soccer scholarship.
He began a Liberal Arts degree in romance literature, departing after a few months and moved to San Francisco, California to study photography at the San Francisco Art Institute.Among other things, he stated: I'm straight, but the character was too important to me to muddle his world with my private life. I think it may have helped to introduce Brian as a believable gay man. However it played, it's been out of my hands for a long time.At the Rise 'n Shine Convention (June 9, 2013), Harold said that he was currently working on a project about Civil War, Field of Lost Shoes.In his theatrical debut, Harold appeared as "Bunny" in Gillian Plowman's Me and My Friends.In 2000, Harold was cast as Brian Kinney, a central character on Showtime's popular gay drama Queer as Folk.Harold joined the cast of Desperate Housewives on the fourth season finale May 18, 2008 as Jackson Braddock, Susan Mayer's love interest.