Rosum Investors


Rosum is backed by a team of venture capitalists and individual investors with a history in creating vibrant, valuable businesses.


Board of Directors

James Spilker, Jr., Ph.D. - Chairman and Co-Founder
Skip Speaks, Chief Executive Officer
James F. Gibbons, Ph.D.
Bill Tai, General Partner, Charles River Ventures
Lara Druyan, General Partner, Allegis Capital


Dr. James Spilker, Jr., Chairman and Co-Founder
James Spilker completed a B.S. in Electrical Engineering at Stanford University in 1955 followed by an M.S. Electrical Engineering, in 1956 and a Ph.D. in Electrical Engineering, in 1958. Both graduate degrees were received from Stanford University. Jim has pursued parallel careers in industry and academia. He is a member of the United States National Academy of Engineering, a Life Fellow of the IEEE, a Fellow of the Institute of Navigation (ION), a recipient of the ION Johannes Kepler Award, and a recipient of the Hall of Fame Award from the GPS Joint Program Office and the US Air Force. Between 1973 and 1999, Jim was founder, Chairman, and CEO of Stanford Telecommunications, Inc. Jim served on the advisory boards for several Internet access and ASIC related companies, as well as the Board of Advisors for the Stanford School of Engineering, the Board of Advisors for the USC School of Engineering, the US Congressional Advisory Board for the International Space Station, and the US Air Force GPS Independent Review Team. He was chairman of the Technical Activities Board for the IEEE Communications Sciences Institute, and a consulting professor at Stanford University. Jim's expertise includes Spread Spectrum techniques, Orthogonal and Multicarrier CDMA, vector delay lock tracking, cable modems, coding schemes, broadband internet access, network management, fixed wireless in multipath channels, adaptive equalization, general relativistic effects, signal propagation, and the Global Positioning System (GPS). He originated various forms of the Delay Lock Loops used in almost all cellular CDMA and GPS receivers. He was also the co-architect of the original GPS system, and the next generation GPS L5 codes.

James F. Gibbons Ph.D.
James F. Gibbons received a B.S. degree at Northwestern University in 1953 and a Ph.D. from Stanford University in 1956. He was appointed Professor of Electrical Engineering at Stanford University in 1964. In 1983, Professor Gibbons was named Reid Weaver Dennis Professor of Electrical Engineering at Stanford. Gibbons then served as the Dean of the School of Engineering at Stanford from 1984 to 1996. Dr. Gibbons invented Tutored Video Instruction, which is widely used at Stanford and elsewhere for continuing education of engineers. He also founded SERA Learning Technologies, dedicated to solutions for pressing social problems, including the education of children of migrant farm workers and anger management for at-risk teens. Dr. Gibbons has served on several committees advising the Presidential Science Advisor during the Nixon, Reagan, Bush and Clinton administrations. In addition to being on the Board at Rosum, Gibbons is a member of the Board of Directors at Lockheed Martin and Cisco Systems. He is a fellow at the Institute of Electrical and Electronics Engineers (IEEE), a member of the American Association for the Advancement of Science (AAAS), the National Academy of Science(NAS), and the National Academy of Engineering (NAE).

Bill Tai, General Partner, Charles River Ventures
Please see Bill's biography at Charles River Ventures' website.

Lara Druyan, General Partner, Allegis Capital
Please see Lara's biography at Allegis Capital's website.

Rosum closed a $15M Series B preferred stock financing in April 2008. Click here to read the press release.

Rosum closed a $16M Series A preferred stock financing in April, 2003. Click here to read the press release.

For investor information, please contact Matthew Lewis, CFO.