Gates joins from Boom Post Production and will start next month.
In addition to being a Bafta Craft award winner in the Best Sound Fiction/Entertainment category for Tsunami: The Aftermath, he also has two Bafta nominations and an Emmy nomination.
His credits include Between the Lines, Primeval and Mutual Friends.
Halo has also picked up a new facility director. Jo Beighton joins from Clear Cut Pictures and will help to consolidate the existing business and to spearhead the company's expansion plans in 2009.
Halo managing director John Rogerson said that the two new appointments were major coups for the company.
“Having people of Jo and Pete's standing helps our ever increasing profile as a provider of the highest quality post production,” he said. “Jo's knowledge and experience over all aspects of post production is absolutely invaluable to us. She will be vital to the expansion of our core post business and other associated projects throughout 2009.
“Pete's level of experience and skill is simply outstanding and with recent improvements in our grading department and [colourist] Ross Baker's arrival from M2/Rocket it will enable us to offer a complete in-house service for higher end documentary and drama work.”