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Keith Fullenweider

Keith Fullenweider Partner, Mergers & Acquisitions and Private Equity

Keith advises clients in mergers and acquisitions, private equity investments and buyouts, and general corporate control and securities matters. He serves on the firm’s Management Committee and as head of the Corporate department.

Experience Highlights

  • AltaGas in the $6.4 billion acquisition of WGL Holdings, owner of a regulated natural gas utility, a midstream franchise and non-regulated contracted power and energy marketing businesses throughout the United States
  • Select Energy Services in its $1.3 billion merger with Rockwater Energy Solutions
  • Blackstone in the $2 billion acquisition of Eagle Claw Midstream Ventures from EnCap Flatrock Midstream
  • Tudor, Pickering, Holt & Co. in its business combination with Perella Weinberg Partners
  • Vantage Energy in its $2.7 billion sale to Rice Energy 
  • Nexeo Solutions, a chemicals and plastics distributor and TPG Capital portfolio company, in its $1.575 billion merger with WL Ross Holdings Corp., a special purpose acquisition company formed by WL Ross
  • The Conflicts Committee of the Board of Directors of El Paso Pipeline Partners in the $76 billion acquisition by Kinder Morgan Inc. of El Paso Pipeline Partners, Kinder Morgan Pipeline Partners and Kinder Morgan Management
  • Jonah Energy in its $580 million acquisition of natural gas and oil producing properties in the Jonah and Pinedale fields and surrounding area from LINN Energy

Mergers & Acquisitions

  • The Shaw Group in its $3 billion sale to Chicago Bridge & Iron
  • TPG Capital in its $1.8 billion acquisition of natural gas properties in Wyoming’s Jonah field from Encana Corporation
  • TPG Capital and Acon Investments in the $775 million sale of the general partner of Northern Tier Energy, owner of a Minnesota refinery and related assets, to Western Refining
  • Quantum Energy Partners in its joint acquisition with Forum Energy Technologies of Global Tubing, a coiled tubing manufacturer
  • Sidewinder Drilling, an Avista Capital Partners portfolio company, in the $242 million acquisition of Union Drilling, a publicly traded land drilling services and equipment contractor
  • The Carlyle Group in the acquisition of the North American power generation assets of Cogentrix Energy, including five coal and solar power projects and a development pipeline of gas and renewable projects, from The Goldman Sachs Group
  • TPG Capital in the $979 million acquisition of Ashland Inc.’s global chemical distribution business
  • TPG Capital and ACON Investments in the $900 million formation of Northern Tier Energy, and acquisition of a Minnesota refinery and related retail assets from Marathon Petroleum

Private Equity Investments

  • TPG Capital in its $1.25 billion group investment in Chesapeake Cleveland-Tonkawa, a subsidiary of Chesapeake Energy Corporation
  • Crestview Partners in its $150 million line of equity commitment to W Energy Partners, a company focused on exploration and production assets in the Bakken shale play 
  • Canada Pension Plan Investment Board in its $300 million PIPE purchase of Halcon Resources Corporation common stock in connection with Halcon’s purchase of oil and gas assets in the Williston Basin
  • Crestview Partners in its $100 million commitment to Silver Creek Oil & Gas, an oil and gas exploration and production company
  • Tudor, Pickering, Holt & Co. in a minority investment by BDT Capital Partners

Contact Details


T +1.713.758.3838
F +1.713.615.5085
1001 Fannin Street
Suite 2500
Houston, TX 77002
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Keith's Practices

  • The University of Texas School of Law, J.D. with high honors, 1988 (Chancellors; Order of the Coif; Texas Law Review)
  • Princeton University, A.B., History summa cum laude, 1985
  • Attended the University of London, 1988
  • Admitted to practice: Texas
  • Law 360’s MVP List for Energy, 2014
  • Chambers Global, Energy: Oil & Gas (Transactional) (USA), 2011−2013
  • Chambers USA, Nationwide Energy: Oil & Gas (Transactional) 2010−2018; Corporate/M&A (Texas), 2010−2018
  • Legal 500 U.S., M&A: Large Deals, 2015−2018; Venture Capital and Emerging Companies, 2017; Private Equity Buyouts, 2011−2018; Energy: Transactions, 2014, 2016−2018; Project Finance, 2018
  • The Best Lawyers in America© (Woodward/White, Inc.),  "Lawyer of the Year," Mergers & Acquisitions (Houston), 2013, 2016, and 2018
  • The Best Lawyers in America© (Woodward/White, Inc.), Mergers and Acquisitions Law, 2007−2019
  • Selected to the Texas Super Lawyers list, Super Lawyers (Thomson Reuters), 2003−2018
  • Advisory Director: Catholic Charities of Galveston-Houston
  • Director and Executive Committee Member: The Boys and Girls Club of Greater Houston (Board Chair: 2010–2011)
  • Former Director: The University of Texas Law School Alumni Association, Kinkaid School Alumni Association, and The Fay School