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M. Breen Haire
 

M. Breen Haire

Partner
 
600 Travis Street, Suite 5400
Houston, TX 77002 

Breen Haire is Co-Managing Partner of Simpson Thacher’s Houston office and Co-Head of the Firm’s Energy and Infrastructure Practice. Breen focuses on mergers and acquisitions and private equity transactions across the infrastructure sector, including in the energy, digital infrastructure and transportation industries. His energy experience includes representing major operating companies and investors in the power, renewables and oil and gas exploration and production, midstream, oilfield services, contract drilling and petrochemicals sectors.

Chambers-ranked practitioner, Breen was named as “2025 Dealmaker of the Year” by The American Lawyer and “Top 2024 Texas M&A dealmaker,” by Texas Lawbook. In addition, he has been recognized as a “Rising Star” by Texas Monthly and a “Texas Trailblazer” by Texas Lawyer.

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Work Highlights
  • KKR in its establishment of a joint venture with T-Mobile to acquire Metronet
  • WhiteWater in the formation of a joint venture with MPLX LP and ONEOK, Inc. to construct the Eiger Express Pipeline
  • Infrastructure at Goldman Sachs Alternatives in its acquisition of Liquid Environmental Solutions (“LES”) from Audax Private Equity
  • KKR and PSP in the acquisition of a 19.9% interest in American Electric Power’s Ohio and Indiana & Michigan transmission companies for $2.82 billion
  • KKR in its entry into a definitive agreement to sell its 23.4% interest in Colonial Pipeline to Brookfield Infrastructure Partners
  • WhiteWater in its entry into a definitive agreement to sell, together with affiliates of Diamondback Energy, 55% of the interests in BANGL, LLC to MPLX LP for $715 million
  • KKR in its $50 billion strategic partnership with Energy Capital Partners to accelerate the development of data center and power generation and transmission infrastructure
  • KKR in its acquisition of a majority stake in a joint venture with Telefónica Colombia to establish Colombia’s first independent nationwide open access wholesale digital infrastructure company
  • KKR in its acquisition of The Parking Spot ("TPS") from an affiliate of Green Courte Partners, LLC
 
Accolades
  • “Dealmaker of the Year,” American Lawyer, 2025
  • “Top 2024 Texas M&A dealmaker,” Texas Lawbook, 2024
  • “Texas Trailblazer,” Texas Lawyer, 2020
  • “Texas Rising Star,” Texas Monthly, 2007–2012
Education
  • New York University School of Law, 1999 J.D.
    magna cum laude; Editor, New York University Law Review; Order of the Coif
  • Boston University, 1994 B.F.A.
    summa cum laude
Admissions
  • Texas 2004

Breen Haire is Co-Managing Partner of Simpson Thacher’s Houston office and Co-Head of the Firm’s Energy and Infrastructure Practice.

Breen represents private equity investors and public and privately-held parties in negotiated acquisitions and dispositions, controlled auctions and investments. He works on transactions in the infrastructure sector, including in the energy, digital infrastructure, telecommunications and transportation industries. Breen’s experience in the energy sector includes representing operating companies and investors in the power, renewables and oil and gas exploration and production, midstream, oilfield services, contract drilling and petrochemicals industries.

A Chambers-ranked practitioner, Breen was named as “2025 Dealmaker of the Year” by The American Lawyer and “Top 2024 Texas M&A dealmaker,” by Texas Lawbook. In addition, he has been recognized as a “Rising Star” by Texas Monthly and a “Texas Trailblazer” by Texas Lawyer.

Breen's representative transactions include:

  • KKR in its establishment of a joint venture with T-Mobile to acquire Metronet
  • WhiteWater in the formation of a joint venture with MPLX LP and ONEOK, Inc. to construct the Eiger Express Pipeline
  • Infrastructure at Goldman Sachs Alternatives in its acquisition of Liquid Environmental Solutions (“LES”) from Audax Private Equity
  • KKR and PSP in the acquisition of a 19.9% interest in American Electric Power’s Ohio and Indiana & Michigan transmission companies for $2.82 billion
  • KKR in its entry into a definitive agreement to sell its 23.4% interest in Colonial Pipeline to Brookfield Infrastructure Partners
  • WhiteWater in its entry into a definitive agreement to sell, together with affiliates of Diamondback Energy, 55% of the interests in BANGL, LLC to MPLX LP for $715 million
  • KKR in its $50 billion strategic partnership with Energy Capital Partners to accelerate the development of data center and power generation and transmission infrastructure
  • KKR in its acquisition of a majority stake in a joint venture with Telefónica Colombia to establish Colombia’s first independent nationwide open access wholesale digital infrastructure company
  • KKR in its acquisition of The Parking Spot ("TPS") from an affiliate of Green Courte Partners, LLC
  • KKR in Metronet’s acquisition of US Internet
  • WhiteWater in its joint venture with an affiliate of Targa Resources Corp. to construct Blackcomb Pipeline
  • KKR in its acquisition of an indirect minority equity interest in the Labrador Island Link from Emera Inc.
  • KKR in its agreement with Hannon Armstrong Sustainable Infrastructure Capital, Inc. under which the parties will establish CarbonCount Holdings 1 LLC to invest up to a combined $2 billion in climate positive projects across the United States
  • ISQ Whistler Holdings, a portfolio company of WhiteWater Midstream and I Squared Capital, in the formation of a strategic natural gas pipeline joint venture with Enbridge Inc. and Marathon Petroleum
  • KKR in its acquisition of approximately 1,100 wireless communications towers in Colombia from Tigo Colombia
  • KKR in its acquisition and financing of an interest in the Port Arthur LNG Phase 1 Project from Sempra Infrastructure
  • ISQ Whistler Holdings in the formation of a strategic natural gas pipeline joint venture with Enbridge Inc. and Marathon Petroleum
  • Goldman Sachs Asset Management in connection with its acquisition of ImOn Communications, LLC
  • KKR in its $3.37 billion acquisition of a non-controlling, 20% interest in Sempra Infrastructure Partners
  • WhiteWater in an agreement to sell certain interest in Matterhorn Express Pipeline to I Squared, MPLX LP and Enbridge Inc.
  • An infrastructure funds group affiliated with Goldman Sachs Asset Management in their equity investment in Synthica Energy
  • KKR in connection with its acquisition of a majority stake in Refresco Group B.V. a global independent beverage solutions provider
  • KKR in its acquisition of Boasso Global, the premier provider of depot, maintenance, cleaning, and transportation services for ISO tank containers in North America
  • Atlantic Aviation in its acquisition of three fixed-base operations at Omaha, Nebraska; Raleigh-Durham, North Carolina; and Hartford, Connecticut
  • KKR in connection with its acquisition of a majority stake in Telefónica Chile’s existing fiber optic network to establish Chile’s first open access wholesale fiber optics company
  • KKR in the formation of Global Technical Realty, a build-to-suit and roll-up acquisition data center platform in Europe
  • KKR in connection with its commitment to acquire commercial aircraft in partnership with Altavair AirFinance
  • Vistra Energy Corp., the parent company for TXU Energy and Luminant, in its completed merger with Dynegy Inc.
  • KKR in its original investment in MetroNet, the nation’s largest independently owned, 100 percent fiber optic network provider
  • First Infrastructure Capital, Ridgemont Equity Partners and WhiteWater in the sale of their interests in the Whistler Pipeline
  • Boasso Global in its merger with Quala
  • KKR in its $1.2 billion acquisition of Rocky Mountain Midstream (f/k/a Discovery Midstream) through a joint venture with Williams
  • Marathon Oil Corporation in its Permian basin acquisitions of over 90,000 net mineral acres for $1.8 billion
  • KKR in the sale of SunTap Energy to an undisclosed buyer
  • KKR in its acquisition of oil and gas infrastructure assets of Pemex
  • An affiliate of Investindustrial in the combination of Polynt Group and Reichhold to form a global company in the coating and composite resins industry
  • KKR in its joint venture with Monterra Energy to pursue investments in the midstream energy sector in Mexico
  • KKR and its preferred equity investment in Genesis Energy, L.P. in Genesis’ acquisition of all of Tronox Limited’s trona business
  • A special committee of the board of directors of Keane Group, Inc. in Keane’s definitive agreement with C&J Energy Services, to combine in an all-stock merger of equals
  • PPL Corporation in its Reverse Morris Trust transaction with Riverstone Holdings creating Talen Energy Corporation

Breen received his J.D., magna cum laude, from New York University School of Law where he was an Editor of the New York University Law Review and a member of the Order of the Coif. He received his B.F.A., summa cum laude, from Boston University. Breen is admitted to practice in Texas.

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