Michael was one of the original-founding partners of Gold Greenlees Trott which, from its launch in 1980, grew to become one of the great names in British advertising. Under Michael's guidance GGT grew into an international advertising and marketing group providing services in advertising, sales promotion, direct marketing and media buying and planning. GGT plc. was listed on the London Stock Exchange in 1986 at which time Michael became Chairman and Chief Executive Officer, a role he occupied for over 10 years until the sale to Omnicom in 1998 when he joined the Board of Omnicom and served as President & Chief Executive of TBWA Worldwide. In 2001 he was made Executive Vice-President of Omnicom.