Greg developed his love for computers, and particularly programming and playing computer games, while attending South Australian private school Prince Alfred College. Although he left school with visions of becoming a top lawyer, after spending a couple of years practicing as a lawyer he decided he liked video games better.
Ratbag Games was founded in 1993 in Adelaide, South Australia by friends Greg Siegele and Richard Harrison. Initially known as Emergent Games, the company took 3 years to finish a prototype for their first title Powerslide. Following its acquisition by Midway Games on August 4, 2005 the company was known as Midway Studios - Australia. Employees at the studio were told on December 13, 2005 that Ratbag was going to be closed by its parent company, and subsequently was two days later on the 15th, leaving the staff employed there without a job.