 Strong form at state level led to his selection for Australia A during the 2006 off-season, as well as a two-year stint with Derbyshire in English county cricket.Birt transferred to Western Australia for the 2011–12 season, but has found more success in the Twenty20 format, variously representing the Wellington Firebirds, Delhi Daredevils, Nagenahira Nagas, and Khulna Royal Bengals in New Zealand, Indian, Sri Lankan, and Bangladeshi domestic tournaments, respectively.Birt made his Twenty20 International debut for Australia in February 2010, and has played a total of four matches for the team, with his last international match coming in February 2012.