Board of Directors

Terry D. McCallister

Mr. McCallister is the former Chairman of the Board of WGL Holdings, Inc. and former Chief Executive Officer of WGL and of Washington Gas Light Company from October 2009 to July 2018. Prior to this, he served as President and Chief Operating Officer of WGL and Washington Gas, joining Washington Gas in 2000 as Vice President of Operations. He has also held various leadership positions with Southern Natural Gas and Atlantic Richfield Company. 
Mr. McCallister served on the Board of Directors of the American Gas Association and the Southern Gas Association and was Chairman of the Board of Directors of the Gas Technology Institute for 10 years. Mr. McCallister has served on the National Petroleum Council, and on the boards of several business and community organizations, including, among others, the Greater Washington Board of Trade, the Federal City Council, the Alliance to Save Energy, the Smithsonian National Zoo, the National Symphony Orchestra and the INOVA Health System Foundation. 
Mr. McCallister has a Bachelor of Science in Engineering Management from the University of Missouri-Rolla and is a graduate of the University of Virginia's Darden School of Business Executive Program.


Vincent L. Ammann, Jr.

Vincent L. Ammann, Jr., is Executive Vice President and Chief Financial Officer for WGL Holdings, Inc. and Washington Gas. He is responsible for the administration and supervision of all financial functions including accounting, taxes, investor relations, risk management and treasury management.
He began his career in the Detroit office of Deloitte Haskins & Sells (currently, Deloitte & Touche). He was later assigned to the firm's Washington, D.C.-based Public Utilities Services Group which provided research and consulting services to industry clients.
Since leaving Deloitte in 1990, Mr. Ammann has held a number of key leadership positions with public utilities. In addition to serving as Vice President, Accounting, for Connecticut Energy Corp., the parent company for Southern Connecticut Gas Co., Mr. Ammann lead a number of administrative departments at the utility and a non-regulated technology affiliate. After Energy East acquired Connecticut Energy and a neighboring gas utility company, Connecticut Natural Gas Corp., he was named Senior Vice President, Finance and Administration for both utilities.
Mr. Ammann joined Washington Gas in 2004 as Assistant to the Chief Financial Officer and was elected to the office of Vice President in 2005. He was elected Vice President and Chief Financial Officer in 2006. He is a member of the American Institute of Certified Public Accountants and is Chairman of the American Gas Association Finance Committee. 
A Detroit, Michigan native, Mr. Ammann holds a Bachelor of Business Administration from the University of Michigan and Masters of Business Administration from the University of Connecticut. 


Nancy C. Floyd

Nancy C. Floyd is the founder and managing director of Nth Power, a San Francisco based venture capital firm focused on advanced energy technologies, energy efficiency and sustainability. Nth Power has invested $420 million in 56 companies. Ms. Floyd has served on the boards of the American Council on Renewable Energy and the Center for Resource Solutions. She is an active member of Environmental Entrepreneurs (E2), a national community of individual business leaders who advocate sound environmental policy while building economic prosperity. Prior to founding Nth Power, Floyd launched two high-growth energy and telecommunications companies: NFC Energy Corporation in 1982, an early wind development company, and PacTel Spectrum Services in 1985, both of which were successfully sold. She has also worked on energy and telecommunications issues for the chairman of the Vermont Public Service Board. 
Ms. Floyd has a B.A. degree in Government from Franklin and Marshall College and an M.A. degree in Political Science from the Rutgers University Eagleton Institute of Politics.