He is best known for his role as FBI agent David Sinclair on the CBS police procedural thriller Numb3rs (2005–2010), as well as the Quizmaster from Sabrina the Teenage Witch.
[3] From 1993 to 1996, Ballard portrayed Frankie Hubbard (son of All My Children supercouple Jesse and Angie) on the ABC daytime soap opera Loving and its successor series The City.
This guest role reunited him with Michael Weatherly, who previously co-starred with Ballard on three series: Loving, The City, and Dark Angel.
[4] From 2012 to 2015, he played a recurring role on CSI: Crime Scene Investigation as Officer Crawford, a newly promoted detective, after appearing in season 3 as a music producer.
[5] He also guest starred on NYPD Blue, American Dreams, Rizzoli & Isles, Drop Dead Diva, Castle, and Bones.