Zak trained at Millennium Dance 2000, studying all facets of Dance and Musical Theatre. Prior to this, he attended the BRIT school for Performing Arts and Technology and the London Studio Centre. Whilst at college Zak joined the original cast of We Will Rock You (Dominion Theatre), for which additional credits include: Parkinson (BBC), Party at the Palace (BBC), Children in Need (BBC), Party in the Park 2002 and the original cast album. Zak then went on to perform the role of Aaron in Chicago (the Adelphi Theatre), in which he appeared with Ruthie Henshall on So Graham Norton (Channel 4) and in an episode of Absolutely Fabulous (BBC). Zak appeared as Double-J in the UK tour of Saturday Night Fever, in which he also understudied and played the lead role of Tony Manero. In 2005 Zak appeared in Mary Poppins, (Prince Edward Theatre and the Bristol Hippodrome) understudying the role of Robertson Ay and appeared in Aladdin (the Old Vic) understudying the role of Aladdin. Other credits include: the BRIT School Promotional Video 2002 (The Brit Awards); Emma Bunton’s video, ‘Maybe’, also performing with Emma on Top of the Pops (BBC) and Des and Mel (ITV); London Rocks (the Adelphi Theatre); All Time Greatest Love Songs (BBC); backing performer to Michael Buble on Children in Need (BBC) and Showtime at the Stadium (BBC, Millennium Stadium, Cardiff) with choreography by Stephen Mear