Attorneys Mark W. Dell’Orfano

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of counsel | Manchester, NH

Mark’s practice focuses on advising clients in the energy, mining, natural resource, private equity, and technology industries. His experience includes acquisitions, divestitures, and joint ventures (asset and equity); cross-border transactions; energy project development; mining and natural resource project development (diamond, gold, upstream oil & gas); secured and subordinated financing; strategic investments (equity and mezzanine debt); private equity and venture capital transactions; and related tax issues.

Prior to joining Sheehan Phinney, Mark worked for sixteen years in private equity. During that time, he handled legal and business matters for a variety of energy, mining, and natural resource development projects in the United States, Canada, and Latin America, as well as early-stage investments in, and exits from, technology businesses. He began his energy career at age 18, working the summer before college as a wood-fuel “technician” at one of New Hampshire’s original biomass-fired, PURPA-qualifying cogeneration facilities.

Key Cases

  • Represented a New Hampshire private equity fund in connection with the acquisition of non-operated wells and oil and gas properties located in the Wattenburg oil & gas field.
  • Handled negotiations and documentation of a power purchase agreement for an independent power generation client.
  • Advised a New Hampshire renewable energy developer on the preparation of an ISO New England interconnection request and feasibility study.
  • Represented an energy developer on the purchase and sale (equity) of a Massachusetts hydroelectric project.
  • Represented the lead investor in pre-acquisition bridge financing of Nanocomp Technologies, Inc., a New Hampshire-based manufacturer of advanced carbon materials.
  • Represented a lead investor in the sale of a New Hampshire-based, venture-backed software company to Nuance Communications, Inc. (NASDAQ: NUAN).
  • Represented an energy investor in connection with an upstream investment in California oil and gas properties and the joint ownership, development, and operation of them.
  • Represented a private equity lender in a financing transaction secured by working interests and operating rights to certain operated and non-operated oil wells.
  • Represented a developer client on the asset sale and removal of a New Hampshire-based, biomass power plant.
  • Advised a private equity group on its acquisition of mining claims and long-term mineral leases from a Canadian mining company.
  • Represented a Colombian mining company, a branch of a U.S. controlled-foreign corporation, on a cross-border gold mining and mineral processing joint venture.


  • New Hampshire
  • Massachusetts
  • U.S. District Court, District of New Hampshire
  • U.S. District Court, District of Massachusetts
  • U.S. Tax Court
  • U.S. Court of Appeals for the First Circuit
  • U.S. Court of Appeals for the Federal Circuit
  • U.S. Court of Appeals for the District of Columbia Circuit

Civic Involvement

  • Member, American Bar Association
  • Member, Energy Bar Association
  • Member, Manchester Bar Association
  • Member, New Hampshire Bar Association
  • Member, Clean Energy NH
  • NHBA Low-Income Taxpayer Project
  • Rocky Mountain Mineral Law Foundation