In 2008 Troy originated the role of Tobias Rich in the world premiere of Harper Regan at the National Theatre by British playwright Simon Stephens alongside Lesley Sharp as Harper Regan.
Stephen Harper | Harper's Bazaar | Harper's Magazine | Ben Harper | Harper's Weekly | Harper's | Harper Lee | Roy Harper | Harper's Island | Valerie Harper | Bridget Regan | Harper | Clifford Harper | Bruce Harper | Winard Harper | Bryce Harper | Tom Regan | Mark Regan | Julianne Regan | F. A. Harper | Bob Regan | William Rainey Harper | William Harper | Terry Harper | Regan Hagar | Regan | Harper Perennial | Geoff Regan | Elijah Harper | Tarik O'Regan |
Witt's notable productions include Enda Walsh's The New Electric Ballroom at A Red Orchid Theatre, Dennis Kelly's Love and Money, Simon Stephens' Motortown, Pornography and Harper Regan at Steep Theatre, as well as Terence Rattigan's Flare Path (2013 Jeff Nominations, Director and Production) and Edna Ferber and George Kaufman's Stage Door (2011 Jeff Nominations, Director and Production) with the Griffin Theatre.