Rubenstein serves as President & Board Member at AppNexus. He oversees the company's global commercial functions, including Sales, Client Services and Marketing. Prior to joining AppNexus, Rubentein founded and served as VP and General Manager of Google's DoubleClick Ad Exchange. During his tenure at Google/DoubleClick, he held executive positions including VP of Strategic Accounts, where he spearheaded the company's landmark ad technology partnership with AOL. Rubentein joined DoubleClick in 2001 as part of the company's acquisition of FloNetwork, an email marketing ASP. Rubentein holds a BA from McGill University and an MBA from Columbia Business School.