Jeff served as a Vice President, Engineering at Siebel Systems immediately prior to joining Sierra Ventures in 2002. Prior to Siebel, Jeff co-founded and served as Chief Technology Officer and VP Engineering at OnLink Technologies, a Sierra Ventures VI portfolio company that was acquired by Siebel System in a transaction valued at $760 million. Jeff also co-founded and was President at Integrated Business Software. He holds an undergraduate degree in Symbolic Systems and a graduate degree in Computer Science, both from Stanford University. Jeff's investment practice includes software as a service (SaaS), Cleantech and consumer companies. His current portfolio includes Zoom Systems, Corrigo, Inc., Red5 Studios, Inc., greyboxx, Inc., Expresso Fitness and MIOX, Inc.

Bill served as President of Precor for 14 years, building it from a small focused company in 1986 to an industry leader with an extensive product line in 2000. While at Precor, he oversaw the development and introduction of the elliptical trainer, a new fitness mode that changed the industry and catapulted Precor into its leading position. Prior to that, he worked in new product design and operations management in the medical instrumentation, computer and aerospace industries. Bill received an M.S. in Mechanical Engineering and Product Design from Stanford University, and a B.S. in Mechanical Engineering from Texas Tech University. He also completed the Advanced Management Program for CEOs at Harvard University. Bill presently serves on the Boards of The Museum of Flight and LeMond Fitness. His favorite fitness activities include tennis, cycling and strength training.

Dave has been an Expresso Fitness board member since 2004, and CEO beginning in 2009. Dave is a veteran of more than 25 years in the consumer software business, with significant executive experience in technology, product development, and business development. His most recent role was as President of Sierra On-Line, where in addition to leading the company, he was a key member of the team that sold the company to Vivendi (now Vivendi-Universal). Dave brings focus, direction, and professional product development experience to Expresso Fitness. These leadership qualities have led to a successful track record of leading companies from niche player to market leader status. Dave holds a BS in Electrical Engineering from the University of California at Davis, a MS in Electrical Engineering from UCLA and an MBA from California State University at Northridge.

Dion Madsen is a co-founder and Managing Director of Physic Ventures, a San Francisco-based venture capital firm investing in technology-driven, consumer-directed health and sustainable living companies. Prior to co-founding Physic, Dion served as a Managing Director of the investment practice of Unilever Technology Ventures. Dion was previously Partner at RBC Capital Partners, the private equity arm of the Royal Bank of Canada, where he opened the RBC Life Sciences Fund's first U.S. office and led RBC's investments in early-stage, North American healthcare companies. He has served as Chief Financial Officer at Cytovax Biotechnologies and Cyberion Networking Inc., and he has held a variety of management and board positions at numerous biotechnology companies. Dion holds the Chartered Financial Analyst designation, and earned his BA in Commerce from the University of Saskatchewan.