Title Chief Technology Officer, Worldwide Company GroupM Bio Jack is Managing Partner, Director of Digital Platforms Worldwide for Group M, the largest investment management firm in the world. At GroupM, he has global responsibility for technology development and investments. Jack was previously the Chief Product Officer for Simulmedia, co-founder of Solariat and founder of the MIG, the company that grew into Xaxis, the world's largest programmatic media and technology company. Jack writes his mostly indecipherable Twitter feed (@jkellonsmith) from New York where he lives with his wife, two children and constantly expanding extinct camera collection.