Stephen D. Arnold is a founder and managing general partner of Polaris Venture Partners, an early-stage venture capital firm with offices in Seattle and Boston. He currently serves on the boards of directors at CapitalStream, ESurg, Impinj, Malibu Networks, Midstream Technologies, and Syncronex.

Prior to Polaris, Steve served as a special advisor to Burr, Egan, Deleage & Co., following over 10 years in executive positions in the software industry, including serving as vice president of Broadband Media Applications at Microsoft Corp. and as president and CEO of Continuum Productions (now Corbis Corp.), a private company founded by Bill Gates to pioneer the creation of large digital libraries for online distribution. Steve is also a veteran of Lucasfilm Ltd., having held executive positions in several divisions, including what is now LucasArts Entertainment Co. He was a co-founding board member and continues to serve as vice chairman of the board of the George Lucas Educational Foundation.

Steve holds a BS with Honors from Macalester College and an MA and Ph.D. from CIIS in San Francisco.