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Since 1978, John Mercer has concentrated his law practice in the areas of project and corporate finance and other complex transactions, with particular emphasis on the electric power industry. John has extensive experience and expertise in project finance, corporate finance and securities offerings, joint ventures and joint ownership arrangements, mergers and acquisitions, and independent power projects. In June 2009, John left his position as the long-time, firm-wide head of the Project Development and Finance Practice Group at a large, international law firm in order to found Mercer Thompson as an innovative, boutique law firm offering the highest quality, top-tier legal services to companies and projects engaged in power sector transactions, including complex financings, joint ownership structures and arrangements, mergers, sales and acquisitions, project development and other transactions. According to the 2011 Edition of Chambers USA America’s Leading Lawyers for Business, quoting in part from comments made by interviewees, John Mercer is 'an exceptional attorney who is in the highest echelon of legal talent in the country.’ He is ‘highly intelligent, very diligent, creative and easy to work with.’ He is widely regarded as a leading name in the field, particularly in relation to complex finance and project work.”


  • 191 Peachtree Street, NE, Suite 4410
    Atlanta, GA 30303


  • University of Michigan - Ann Arbor, J.D., graduated 1977

Bar Admissions

  • Georgia, State Bar of Georgia

Lawyer of the Year Badge - 2020 - Energy Law Lawyer of the Year Badge - 2013 - Energy Law

Named "Lawyer of the Year" by Best Lawyers® for:

  • Energy Law, Atlanta (2020)
  • Energy Law, Atlanta (2013)

Recognized in The Best Lawyers in America® 2022 for work in:

  • Energy Law
  • Project Finance Law

"John has almost 35 years of experience representing clients in all types of corporate financings, particularly in the energy industry. With this experience, he is able to quickly understand a clients' business and objectives and, in turn, obtain the desired result. I have worked with many lawyers during my career and I don't know that you will find a more qualified and better corporate finance lawyer than John."

"John is one of the top energy lawyers around with a depth of experience and knowledge in global energy law and markets. He has been a valued counsel and partner with me over the past 20 years in closing some of the most challenging energy transactions and financings that I have completed."

- Karl Olsoni (Capital Dynamics, Inc.), Menlo Park, CA

"John Mercer is one of the best transactional lawyers I have ever worked with. He understands the business objectives of the transactions he works on. He also has a range of experience across project finance, syndicated loans, and public debt and equity offerings. He brings a broad perspective into the problem solving arena."

- Raymond Hill (Mirant Corp - Former CFO)

"John Mercer is always my first choice for advice and transaction documentation. John is the best there is."

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