John Marcil has more than 25 years of experience representing clients in high-stakes business transactions. From billion-dollar public company mergers to middle-market exit transactions to emerging company venture financings, John and his team provide strategic guidance and exceptional client service for clients’ most important deals.


  • Mergers and acquisitions
  • Capital markets transactions and securities offerings
  • Credit and term loan facilities
  • Mezzanine and venture debt investments
  • Project development and financings
  • Joint ventures
  • Commercial contracts
  • Corporate governance

John also serves as outside general counsel for emerging and middle-market companies.


John serves a variety of industries, with particular experience in the following areas:

  • Energy and Natural Resources – Electric and gas utilities, independent power producers, oil and gas exploration and production, midstream/pipeline/ storage, project owners/developers, renewable energy, mining and joint ventures
  • Life Sciences – Medical products, pharmaceuticals, biologics, clinical research, life science investors and startups/emerging companies
  • Technology – Telecommunications, IT, energy and medical technology investors and companies of all sizes
  • Professional Services – Engineering, environmental remediation, construction and demolition and government contractors

Personal Interests

John enjoys family, cycling, playing the guitar and exploring the world.

Insights & Events

Leadership & Community

Civic Activities

  • Boulder Building Blocks Fund/Shared Paths — Director, 2017-19
  • Thorne Nature Experience — Trustee, 2011-16 (Chairman, 2014-16)
  • "I Have a Dream" Foundation of Boulder County — Officer and Director, 1999-2005
  • HOPE Columbine Inc. (HOPE Columbine Atrium and Library Project) — Pro Bono Legal Counsel, 1999

Firm Leadership

  • Office Leader, Boulder


  • Chambers USA — Colorado, Corporate/M&A, 2021-23
  • Best Lawyers® — Mergers and Acquisitions Law, 2023-24; Securities / Capital Markets Law, 2023-24
  • Denver Business Journal — 'Who's Who in Energy,' 2016, 2018-19
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