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  • Brian O'Kelley CEO & Co-Founder

    Widely considered a visionary in the field of online media, Brian is the architect of AppNexus’s strategy to redefine the online advertising industry. As CTO of Right Media (acquired by Yahoo! for $850MM in July 2007) he created the first successful ad exchange. Applying that experience to develop AppNexus’s technology platform, he has created a foundation on which other companies now build their advertising businesses. Prior to Right Media, Brian was CEO of Netamorphosis, an early social networking and e-commerce site for events and venues, and was also an early innovator in real-time personalization and real-time ad optimization at LogicSpan, a consulting and technology integration firm. He later co-founded Cetova, a web-based reporting and analytics platform for enterprise financial systems. While earning a computer science degree at Princeton University, Brian started a web design firm, building an open-source e-commerce engine used by more than 100 companies. Brian is an active partner at Grape Arbor, an angel investor group.  Since its founding in 2006, Grape Arbor LLC has made investments into more than a dozen technology companies.

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  • Mike Nolet CTO & Co-Founder

    Mike oversees the Engineering and Technical Operations teams, having helped design the AppNexus system that handles over 12 billion ad requests a day. Prior to founding AppNexus, Mike was Director of Analytics and Product Manager at Right Media (acquired by Yahoo! for $850MM in July 2007), where he designed and managed key applications, including predictive optimization, inventory forecasting, and Media Guard, which protects publishers from harmful or unwanted ad content. Mike's deep understanding of the intersection between business needs and technology innovation began at 15, when he sold his first software application, and continued at Princeton University, where he studied Economics. On his popular blog, MikeOnAds, Mike analyzes the fast-changing display ad management and buying space, and the dynamic interplay between ad networks, ad exchanges, real-time bidding and the entire ecosystem.

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  • Michael Rubenstein President

    Michael provides global oversight for the company’s commercial operations, including Sales, Marketing, Client Services, and Strategic Partnerships. Prior to joining AppNexus in 2009, he held executive positions at Google/DoubleClick, including founder and General Manager of the DoubleClick Ad Exchange and VP of Strategic Accounts. In 2004, as DoubleClick's VP of Strategic Accounts, he spearheaded the company's landmark partnership with AOL. Michael joined DoubleClick in 2001 as part of the company's acquisition of FloNetwork, an email marketing ASP. Michael started his first ad network while earning a BA in International Relations from McGill University. He also holds an MBA from Columbia Business School.

  • Ari Paparo Senior Vice President, Product

    Ari is responsible for driving the strategy and product development of the AppNexus ad platform. A well-known and respected member of the online advertising community, Ari brings over 10 years of experience developing leading rich media and online advertising solutions. He joined AppNexus from the Nielsen Company, where he served as EVP of Product for Nielsen Online. Prior to that, Ari served as a product leader for DoubleClick and Google, managing the DoubleClick buy-side suite, including DART for Advertisers, DoubleClick Rich Media, DoubleClick Video, and related products. Ari received a BS in Marketing from Georgetown University and an MBA from Columbia University.

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