Dr. Buchalter has served as a director since July 2019. Dr. Buchalter is the Chief Executive Officer of Place Exchange, Inc., a technology company in the digital advertising space, a position he has held since July 2021. From May 2017 to July 2021, Dr. Buchalter served as the Chief Executive Officer of Intersection Holdings, LLC ( Intersection ), a leading smart cities media and technology company. At Intersection, Dr. Buchalter s responsibilities included leadership of the Infosec Leadership Team, which was responsible for overseeing the company s security and risk management issues, including data security and privacy issues. From July 2008 to January 2017, Dr. Buchalter served as the Chief Operating Officer and then President of MediaMath, a leading programmatic advertising technology platform. From January 2005 to April 2008, Dr. Buchalter was a Senior Partner at the marketing consultancy and agency Rosetta, where he led the Digital Media & Technology vertical. Prior to that, Dr. Buchalter was an Associate Principal in McKinsey & Company s Media & Technology practice and a founding member of their Innovation practice. Dr. Buchalter holds a B.S. in Physics from Stanford University, a Ph.D. in Astronomy from Columbia University, and was a postdoctoral fellow in Theoretical Astrophysics at the California Institute of Technology. Dr. Buchalter is a business executive with significant experience building and leading technology companies. Dr. Buchalter s expertise as a business executive includes business administration, sales and marketing, product development, engineering, and operations, providing him with a perspective that the Board values.