ZOO Digital Group has two primary business units—ZOO Digital Publishing, which develops, licenses and publishes video games, and ZOOtech, which develops software for producing interactive DVD titles. Game and DVD titles released through ZOO Digital Publishing include Alien Hominid, the Premier Manager series and Who Wants To Be A Millionaire, and ZOOtech clients include Celador and Ascent Media. CEO Ian Stewart founded the company in 1999.