Photo of Mary A. HennesseyPhoto of Mary A. Hennessey

Mary A. Hennessey



Wayne State University Law School, J.D.
  • Order of the Coif; State Bar of Michigan's "Excellence in the Study of Taxation" award
  • The Wayne Law Review, Senior Articles Editor
University of Michigan, B.A.
  • Program in the Environment
  • with honors; Bentley Scholarship
  • Study abroad session at University of Cape Town, South Africa


News & Resources


Mary Hennessey is a tax attorney who advises clients on corporate and partnership taxation matters, including mergers and acquisitions, federal taxation of real estate transactions, entity structuring, income tax planning, and tax-exempt entities.

Mary is also a member of Honigman’s Emerging Companies Group.


Representative Matters

  • Drafted organizational documents such as operating agreements containing intricate partnership tax-distribution and -allocation provisions

  • Counseled clients in transactions involving tax incentives including New Market Tax Credits, Historic Tax Credits, and Opportunity Zones

  • Represented tax-exempt entities in formation, governance and real estate joint ventures with for-profit entities

  • Litigated state and local tax controversies resulting in settlement agreements with values to clients in excess of $100 million

  • Served as an intern in the Civil Rights Unit of the U.S. Attorney's Office for the Eastern District of Michigan
  • Served as a judicial intern to the Honorable Nancy G. Edmunds, U.S. District Court for the Eastern District of Michigan

Prior Experience

  • Dykema Gossett PLLC, Associate, 2013-2017


Professional & Community Involvement

Michigan Women's Tax Association, Program Committee

State Bar of Michigan, Tax Section

Community Foundation for Southeast Michigan, Professional Advisors Philanthropic Institute

News & Resources

Press Releases


Seminars & Events

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