He will help keep the agency ahead of the pace on production developments, focusing on craft.
Craigie Atherton joins in September, and comes from Adam & Eve/DDB, where he was head of integrated production.
He joined the agency in 2009, when it was known as Adam & Eve. Before this he worked at CHI & Partners and Blink Productions. Atherton has also worked at Grey and TBWA\Media Arts Lab on a freelance basis.
Katie Mackay, head of strategy at Mother, said: "We've had our eye on Matt and the work he's been part of for a while. He leads his teams to deliver brilliantly modern entertainment ideas in all their guises. He’s a very welcome addition to our family."