As General Manager of Mansfield Power and Gas, LLC, Tammy is responsible for all commercial and operational activities, including strategy, sales and marketing, scheduling, trading and customer service functions. Tammy’s expertise spans natural gas, power, liquefied natural gas, natural gas liquids, coal and renewable products. Tammy’s past roles include Vice President of Utility Sales, Power Origination, and Mergers and Acquisitions for Shell Energy N.A. Prior to Shell, Tammy held various senior leadership roles at RBS Sempra Commodities and its predecessor company, Sempra Commodities. These roles include Managing Director leading derivatives marketing to bank customers and serving as the liaison between the trading company and the bank.
Prior to Sempra, Tammy was Vice President and Head of Global LNG for Dynegy, Inc. where she developed a liquefied natural gas business and was accountable for all business strategy and milestones resulting in the Hackberry LNG facility, later sold to Sempra Energy and renamed Cameron LNG. Earlier in her career, Tammy was Vice President of U.S. Wholesale Energy Trading and Origination for BP Gas & Power. Tammy holds a BBA in Accounting & Finance from the University of North Alabama. She was named one of the top 15 Business Women of Houston in 2016 by the U.S. National Diversity Council.
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