Hayden S. Baker


New York
Business Phone: 212.704.6088
Business Fax: 212.704.6288



Hayden Baker is a partner in the Capital Projects and Infrastructure practice. He assists clients in mergers and acquisitions, energy and infrastructure projects, real estate deals and financing transactions. He has won recognition from Chambers USA, The Legal 500 and New York Super Lawyers.

Hayden is particularly well regarded for his sophisticated, practical approach to transactions, having represented companies, private equity investors and financial institutions in hundreds of transactions, totaling well over $100 billion in investment. Clients praise his blend of strengths, saying: "He is very detail-oriented, very commercial and good at seeing what matters. He is levelheaded, very responsive and just a great guy to work with." Hayden regularly counsels clients in the energy, chemicals, technology and infrastructure sectors.

Most recently, Hayden was a partner in Sullivan & Worcester’s corporate practice. Previously, he practiced at Davis Polk & Wardwell, where for nearly 10 years he counseled clients worldwide on high-stakes corporate transactions, with an emphasis on environmental and energy matters.

Representative Client Work

Mergers & Acquisitions

  • Represented a publicly traded investment bank in its acquisition of an independent, global investment bank, which transaction won a "Cross-Border Deal of the Year" award from The M&A Advisor.
  • Represented an e-sport matchmaking and tournament platform in its acquisition of a U.S.-based platform provider and a related licensing transaction.
  • Represented a private equity fund and its portfolio company in the acquisition of a manufacturing enterprise.
  • Represented a buyer in its acquisition of a specialty chemicals and materials technology company.
  • Represented a global chemical company in the sale of its sulfuric acid virgin production and regeneration business.
  • Represented a strategic buyer in its acquisition of a specialty chemical company serving the needs of the upstream oil and gas sector.
  • Represented a buyer in its acquisition of a large-scale cobalt refinery.
  • Represented a global natural resources company in the sale of its majority stake in certain copper mining operations and supporting infrastructure.
  • Represented a private equity investor in its sale of a majority stake in an automotive safety restraint systems business.
  • Represented a seller in the divestiture of an oil storage, marketing and transportation company, together with related physical inventory and related storage contracts.
  • Represented a private equity investor in its majority investment in a leading producer and distributor of bulk rock salt and packaged specialty deicing products.
  • Represented a global exploration and production company in connection with the divestiture of its U.S. refinery operations.
  • Represented a global chemical company in the sale of its consumer products business.

Energy & Infrastructure

  • Advised a hydropower business in connection with its purchase and upgrade of four hydroelectric power plants located in North Carolina.
  • Represented an infrastructure fund and its affiliated entities in the acquisition of a portfolio of landfill gas-to-energy projects and related commercial matters.
  • Advised an equity investor in the development of a coastal port, including the expansion of several deepwater berths and associated docks and bulkheads, the addition of oil storage capacity and associated pipelines and related infrastructure.
  • Represented a global renewable energy company in its acquisition of a portfolio of development-stage solar facilities.
  • Advised a global infrastructure fund in connection with its acquisition of a leading renewable energy developer, with a development pipeline of solar and wind facilities.
  • Represented a buyer in its acquisition of several operational and development-stage wind farms in Montana.
  • Represented a private equity investor in connection with the development of a greenfield combined-cycle natural gas-fired generation facility.
  • Represented an investor in its acquisition of a district energy chilling system and related infrastructure.
  • Represented a coal company in connection with an enforcement action to address environmental impacts from its legacy mining operations.
  • Advised stakeholders in connection with civil and criminal enforcement actions against a manufacturing enterprise in Chapter 11.
  • Represented a chemical refinery in negotiations with neighboring facility regarding shared wastewater treatment operations.
  • Represented multiple coal mining companies in connection with their Chapter 11 proceedings, including related debtor-in-possession financing, asset sales and negotiations to resolve legacy environmental and reclamation impacts.
  • Represented an institutional investor in the debt financing of a utility scale solar project.

Securities & Finance

  • Represented a global power company on its SEC-registered notes offering.
  • Represented an oil and gas exploration and production company in connection with limited-recourse bridge loan.
  • Represented an independent power company with significant interests in wind power projects on its SEC-registered equity offering.
  • Represented underwriters in connection with a convertible notes offering for a mining company engaged in the acquisition, exploration, development and operation of precious metal properties.
  • Represented a global oil and gas company in connection with the spin-off of its retail marketing business.
  • Represented a lender in the financing for the acquisition of a food sanitation services business.
  • Represented an international mining company in connection with its senior notes offering.
  • Represented a lender in connection with an asset-based revolving credit facility for a manufacturing business.
  • Represented a global oil and gas company on its SEC-registered notes offering.
  • Represented underwriters in an SEC-registered equity offering for a shipping company providing marine transportation of petroleum products.

Real Estate

  • Advised lenders in connection with the financing of a shopping complex acquisition.
  • Represented a buyer in the acquisition and redevelopment of an historic hotel.
  • Represented an investor in its acquisition of an historic, downtown office building and related financing.
  • Represented the developer of an office complex in its site acquisition and related financing.
  • Represented a real estate investment fund in the acquisition of a media entertainment campus.


  • "Expert Insights: Clean/Renewable Energy M&A: Trends and Best Practices," Lexis Practice Advisor, December 2016.
  • Quoted, "Climate Change Starting to Emerge as a Bankruptcy Issue," Law360, January 29, 2018.
  • Quoted, "Court Provides Blueprint for Challenging Fossil Fuel Projects," Bloomberg BNA, Daily Environment Report, August 16, 2017.
  • "EPA Resolves Scope of Federal Oil & Gas Air Permitting Authority as it Braces for Battle Over Greenhouse Gas Regulation," Bloomberg BNA: Environment Report, August 26, 2016.
  • "A Good Breeze is Blowing for Offshore US Wind Development," Law360, June 8, 2016.
  • "U.S. Offshore Wind Seeks Critical Mass," The Energy Finance Report, March 9, 2016.

Seminars & Presentations

  • Essential Power Sources: Legal Counsel & Managing Energy Deals, Houston, Texas, October 4, 2016.

Professional & Community Involvement

  • New York Lawyers for the Public Interest, Pro Bono Advisory Committee
  • Mordecai Land Trust, Board Member
  • New York Environmental Law Leadership Institute, Alumnus
  • Environment, Energy & Resources Section, American Bar Association
  • Environmental Law Section, New York State Bar Association

Rankings and Recognition

  • Chambers USA, Ranked in Environment: Mainly Transactional (New York) (2012-2017) 
  • The Legal 500 U.S. (2013-2017) 
  • New York Super Lawyers (2013-2017) 
  • "Rising Star," New York Super Lawyers (2011, 2012)



  • American University, Washington College of Law, J.D., summa cum laude, 2002
  • Middlebury College, B.A., 1998

Bar Admissions

  • New York

Court Admissions

  • U.S. District Court for the Eastern District of New York
  • U.S. District Court for the Southern District of New York
  • U.S. Court of Appeals for the Second Circuit