Mike Phelan is Meta's first Senior Fellow, focused on supporting the company's strategic technology priorities, including its investments in artificial intelligence and development of technical talent. From 2024 to 2025, he served as Meta's Chief Technology Officer. Before Meta, Mike was Vice President of Engineering at Mozilla Corporation. He led the global and open product development process behind Firefox. Prior to that he was a distinguished engineer at Sun Microsystems, which acquired his company, CenterRun. He began his career working at start-ups, including a digital effects company where he developed software used in major motion pictures. Mike holds a bachelor's and master's degree in computer science from Stanford University.