David Mann’s practice is focused primarily on upstream and midstream energy transactions. He has represented clients in connection with numerous asset acquisitions and divestitures (including sale processes under Section 363 of the Bankruptcy Code) as well as joint ventures, farmouts, and similar transactions for developing oil and gas assets.

He also advises clients on day-to-day legal issues that arise in the upstream and midstream energy industry and has experience negotiating joint operating agreements, oil and gas leases, easements, surface use agreements, drilling contracts, master service agreements, confidentiality agreements, gathering, processing and disposal agreements, and other energy-related documentation.

Prior to law school, David was a licensed Certified Public Accountant in Texas working as a senior assurance associate with a large public accounting firm.



J.D., South Texas College of Law, summa cum laude, 2016

South Texas Law Review, Executive Editor

B.B.A., Texas A&M University, Accounting, 2010

M.S., Texas A&M University, Finance, 2010




  • Judicial Intern, the Honorable Jeff Bohm, United States Bankruptcy Court for the Southern District of Texas
  • Judicial Intern, the Honorable David Hittner, United States District Court for the Southern District of Texas


Upstream and Midstream Acquisitions and Divestitures

  • $1.2 billion sale of Marcellus Shale assets.
  • $325 million acquisition of Delaware Basin water infrastructure assets, including negotiation of related long-term commercial agreements for freshwater supply and disposal of produced water.
  • $155 million acquisition of Uinta Basin assets.
  • $75 million sale of Uinta Basin assets.
  • $55 million sale of Permian Basin mineral and royalty interests.
  • $42 million sale of North Dakota Bakken assets.
  • $35 million sale of Texas and Louisiana Gulf Coast assets.
  • ~$31.8 million sale of Permian Basin mineral and royalty interests in an all equity transaction.
  • $30 million sale of Eagle Ford assets.
  • Sale of offshore Gulf of Mexico assets in a cashless transaction where purchaser assumed all decommissioning liabilities.
  • Negotiation of asset exchange and related documentation in connection with separation of a joint venture involving over 600,000 net acres in the Marcellus Shale.

Joint Ventures, Farmouts and Other Energy-Related Transactions

  • $1.0 billion upstream and water joint venture for the development of Green River Basin assets.
  • $200 million upstream joint venture for the development of Utica Shale assets.
  • $600 million oil and gas wellbore asset-backed-securitization (ABS) transaction.
  • $100 million oil and gas wellbore asset-back-securitization (ABS) transaction.
  • Negotiation of long-term gathering, processing, and disposal agreements in connection with the formation of a joint venture between a private equity firm and a public E&P company.
  • Negotiation of multiple farmouts and joint development agreements involving onshore Colombian oil and gas concessions.
  • Negotiation of surface use and access agreement with Uinta Tribe.




State Bar of Texas, Oil, Gas, and Energy Resources Law Section

Houston Bar Association, Energy Law Section

Houston Young Lawyers Association, Member