William Fitzgerald

Managing Director and Chief Investment Officer

Prior to co-founding GIAM in 2010, Mr. Fitzgerald formerly served as Managing Director and Chief Investment Officer of Nuveen Asset Management. As CIO, Mr. Fitzgerald was responsible for the management of $65 billion in infrastructure debt funds (130 different funds, including senior and mezzanine debt, unlisted and illiquid debt securities). During his tenure as CIO, Nuveen Asset Management was named 2005 Fixed-Income Manager of the Year for Large Mutual Funds by Lipper Analytical Services. Under his leadership, Nuveen Asset Management also expanded its investment capabilities to include equity, mezzanine debt and alternative investment funds.

Mr. Fitzgerald has a BA from Beloit College and an MBA from the University of Chicago. He is also a Chartered Financial Analyst. His opinions of the capital markets have appeared in The Wall Street Journal, BusinessWeek and Barron's and he has appeared regularly on CNBC and Bloomberg Television.


Clay Norrbom

Former Managing Director

Mr. Norrbom left GIAM in 2016 and joined a former portfolio company.

John Nelson

Chief Technical Officer

Mr. Nelson is the former Chief Executive Officer of Affiliated Engineers Incorporated ("AEI"), a national engineering and design firm headquartered in Madison, WI.  As CEO, Mr. Nelson helped lead the growth of the firm to $65 million in annual revenue, 10 principal offices and 600 employees.  His career at AEI spanned twenty-seven years, where he also served as a project engineer and project manager on numerous large-scale projects in infrastructure, energy, higher education, health care, research facilities, and office headquarters. Since leaving AEI, Mr. Nelson has served as an Adjunct Professor in the Department of Civil and Environmental Engineering at the University of Wisconsin-Madison and has worked as an independent consultant. In his consulting practice, Mr. Nelson has advised construction firms, large companies, venture capital funds, and universities on business strategy, master planning, energy usage, lean design and sustainable development.

Over his career, Mr. Nelson has authored numerous articles and has been a frequent presenter at engineering and construction trade conferences on issues of energy usage, sustainable development, and lean building practices. He is a member and former Chair of the Board of Visitors of the Nelson Institute of Environmental Studies at the University of Wisconsin-Madison and a Director and member of the Investment Committee of the University of Wisconsin Foundation. Mr. Nelson has a BS in Mechanical Engineering from Bradley University and an MS in Mechanical Engineering from the University of Wisconsin-Madison. As part of his MS studies, he was one of the early researchers at the University of Wisconsin's Solar Energy Lab, one of the oldest facilities of its kind in the world. He is a Registered Professional Engineer.