Mack joined the New York-based CPA firm in July 2009. Prior to that he was president of the West Valley Group from January 2008 through his joining EisnerAmper. From 2001 through December 2007, he was with Smart Business Advisory and Consulting where he was senior managing director. He spent 12 years at Ernst & Young where he was a senior manager. Mack  has more than 25 years of client service experience with insurance, financial services, and life science companies and has worked with companies from start-ups to Fortune 50 entities and with private, public and alternative ownership structures.