Groom will join O&M’s senior management team, and will aim to drive the effectiveness of the agency’s planning offering, as well as helping to build on the behavioural economics agenda that has been set by the Ogilvy Group vice-chairman Rory Sutherland.
He will work closely with Ogilvy Group's planning director Rachel Hatton and executive creative director Gerry Human, and will report in to the agency’s chief executive Hugh Baillie.
Groom has already worked with Baillie once before, during their time together at Bartle Bogle Hegarty.
At Engine, Groom helped launch Engine Strategy, an integrated planning unit that acts as a central hub for the group's agencies.
He is also the founder of Edwards Groom Saunders, the communications planning agency that was acquired by Engine in March 2009.
Groom's departure from Engine comes just two weeks after Alison Wright, another of the group's strategy directors, left the agency to go and run a bakery in Cambridge.