"Andy Grainger", as he was initially credited, formulated an acting career through his love of musicals. He began a West End theatre acting, dancing and singing career in 1987 at age 22 at the Prince of Wales Theatre playing "Benjamin" in a stage and road production of Seven Brides for Seven Brothers, directed by Michael Winter, and in 1990 playing "Lt. Buzz Adams" in South Pacific, directed by Roger Redfarm. He also portrayed "Dr. Orin" in a 1994 production of A Little Shop of Horrors at the Oldham Coliseum Theatre directed by Lindsay Dolan.
Among the feature films he has appeared in are Parting Shots (1999), In the Beginning (2000), Large (2001), Spy Game (2001), Mean Machine (2001), Kiss Me Deadly (2008) and The Lovely Bones (2009).
Grainger moved to New Zealand in 2006 to start a family with his wife, Sacha. Living near Waiake Beach in Torbay, they have two young children. "I think in life if you have an opportunity to try things new you should embrace them, and the lifestyle here is fantastic."
In 2013, he appears as "Geoff Tordoff" in a production of The Heretic with the Auckland Theatre Company.
