William S. Brennan

Managing Partner Griffin Ventures LLC

Prior to Griffin Ventures, Bill was the Managing Director and Co-Chief Investment Officer of Ultra Capital. Ultra was founded to bridge the gap between developers seeking capital for local, distributed sustainable real asset projects and investors seeking cash-yielding, consistent, non-correlated returns from real assets in water, agriculture, energy, and waste.  Mr. Brennan was instrumental in Tiger Management’s direct investment in Ultra in January 2017.

From July 2010 to July 2014, Bill was the Chief Investment Officer and Portfolio Manager for Summit Global Management, Inc., one of the oldest water investment platforms globally overseeing the development and management of water equity strategies for the firm.  From October 2008 to June 2010, he was the President and Managing Partner for Brennan Investment Partners, a water infrastructure and investment firm.  During his career he has been a Portfolio Manager of the Praetor Global Water Equities Fund in Luxembourg and the Kinetics Water Infrastructure Fund (five-star Morningstar rated funds and the #1 fund in 2006, 2007 and 2008 in natural resources category in Europe and the top U.S. manager for natural resource/environmental funds & risk managed in 2008) and a Senior Analyst with Pacific Growth Equities and has held various senior positions with Coopers & Lybrand, Law Engineering and General Electric.  Bill began his career as an Air Force officer and Combat Crew Commander.

Bill serves on the Board of AbTech Industries, WaterMark Development (water development co.),Watership Blue (global mobile infrastructure),The Water Initiative (point of source filtration), the Dean’s advisory council for the School of Engineering at Colorado State University and was a member of Jabil Circuit’s CleanTech Advisory Board from 2010 to 2014.

Bill has a B.S. in Mechanical Engineering and Biology from Lehigh University; an MS in Biomedical Engineering from Colorado State University (Tau Beta Pi) and an MBA from Villanova University where he has also been an adjunct professor in the graduate MBA program.