G. Michael O'Leary


"Enjoys a stellar reputation in the energy space and is especially well known for his work for MLP and energy and oilfield services clients." Chambers and Partners 2014

Straight Talk® is good business
600 Travis
Suite 4200
Houston, TX 77002
P: +1.713.220.4360
F: +1.713.238.7130
G. Michael O



G. Michael O'Leary


Houston Office
600 Travis
Suite 4200
Houston, TX 77002
P: +1.713.220.4360
F: +1.713.238.7130

Mike is a member of the Policy Committee and co-chair of the Corporate/Securities practice.

Mike has an extensive corporate securities and mergers and acquisitions practice with particular emphasis on representation of issuers and underwriters in public and private offerings of equity and debt securities; representation of buyers, sellers and special committees in mergers and acquisitions (domestic and foreign) and of private equity firms investments in energy and energy infrastructure; redemptions and exchanges of corporate debt; negotiating complex partnerships and joint ventures; structuring spin-offs and "going private" transactions; and corporate governance. The clients Mike represents include some of the largest and best-known names in the energy business. He has a significant reputation in master limited partnerships, energy and oilfield services, energy infrastructure, private equity investments, pipeline company transactions, royalty trusts and forest products companies.

Representative Experience

  • Counsel to Energy Transfer Partners, L.P. in its $1.5 billion sale of Southern Union Gathering Company to Regency Energy Partners LP.
  • Counsel to La Grange Acquisition, L.P. (a wholly owned subsidiary of Energy Transfer Partners, L.P.) in its sale of ETC Canyon Pipeline, LLC to Summit Midstream Partners, LLC.
  • Counsel to Hilcorp Energy in the sale of Eagle Ford shale assets to Marathon Oil Corporation in a transaction valued at $3.5 billion.
  • Counsel to Hilcorp Energy Company in a $400 million investment by Kohlberg Kravis Roberts & Co. in a newly-formed partnership to own and develop Hilcorp's oil and gas properties in Texas.
  • Counsel to Evercore Partners in the merger of Berry Petroleum with and into LinnCo.
  • Counsel to Cordillera Energy Partners III in its merger with Apache Corporation.
  • Counsel to GSO Capital in its investment in a joint venture with Chesapeake Energy in the Utica Shale.
  • Counsel to Blackstone Capital in its $1.0 billion joint venture with Alta Energy, L.P.
  • Counsel to Energy Transfer Partners and Regency Energy Partners in their joint acquisition to LDH Energy.
  • Issuer's counsel on the Rose Rock Midstream, LP IPO.
  • Underwriters' counsel on the PetroLogistics LP IPO.
  • Issuer's counsel on the American Midstream Partners, LP IPO.
  • Issuer's counsel on  the LRR Energy, LP IPO.
  • Underwriters' counsel on Kinder Morgan Inc. IPO.
  • Underwriters' counsel on the Rentech Nitrogen Partner, L.P. IPO.
  • Underwriters' counsel on the Laredo Petroleum Inc. IPO.
  • Underwriters' counsel on the Oiltanking Partners, LP IPO.
  • Counsel to Hilcorp Energy in the sale to Marathon Oil of Eagle Ford properties owned by a joint venture with KKR and affiliated funds for $3.5 billion.
  • Counsel to Blackstone Capital in its Eagle Ford joint venture with GeoSouthern Energy Corporation.
  • Counsel to Conflicts Committee of the Board of Directors of Energy Transfer Partners L.P. in connection with a transaction relating to Regency Energy Partners, L.P.
  • Counsel to BJ Services Company in connection with its merger with Baker-Hughes Inc.
  • Underwriters' counsel on the Oasis Petroleum Inc. IPO.
  • Underwriters' counsel on the Oxford Resource Partners, LP IPO.
  • Issuer’s counsel on the recent $300+ million common unit offering by El Paso Pipeline Partners, L.P. and $110 million senior note offering by El Paso Pipeline Partners Operating Company.
  • Counsel to Quintana Capital Group in connection with its acquisition of the general partner of Genesis Energy L.P.
  • Counsel to American Infrastructure Group in connection with the formation of American Midstream Partners L.P. and the acquisition from Enbridge Energy Partners L.P. of several intrastate and interstate pipeline systems.
  • Counsel to Global Infrastructure Partners in connection with its acquisition of a 50% interest in Chesapeake Midstream Partners, L.P. and the related acquisition and contribution transactions.


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