Sean Denham, Partner, National SPAC Leader, Grant Thornton Sean Denham is the Global Services Industry Leader and Office Managing Partner (OMP) for Grant Thornton’s Philadelphia office. As OMP, Sean has the privilege of leading an exceptional team of high-performing individuals in the Philadelphia region who provide top tier accounting, advisory and tax services for our clients. As an audit partner of the firm, Sean serves some of Grant Thornton’s most prominent clients including public and private companies in the technology, manufacturing, distribution and professional services industries.