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Peter C. Mulcahy


[email protected]



Peter represents and advises companies across a variety of industries in investigations and through all phases of litigation. 

Prior to joining the firm, Peter was Assistant Attorney General at the Environmental Protection Division of the Massachusetts Attorney General’s Office, where he investigated, litigated, and negotiated the settlement of civil violations of environmental laws, regulations, and related offenses on behalf of the Commonwealth. His cases included multistate investigations involving multinational companies — including a major automotive manufacturer and a global energy company — as well as matters involving the handling and disposal of hazardous materials.  

Earlier, as a senior associate with a large law firm in Boston, Peter worked on US and international investigations involving multinational financial institutions, manufacturers, and NGOs. Prior to law school, Peter worked for Professor Alan Dershowitz at Harvard Law School, and researched topics for books and articles on terrorism, national security, and civil liberties.


  • Harvard Law School (JD)
  • Harvard College (BA, cum laude)


  • Co-chair, Environmental Litigation Committee, Boston Bar Association (2016 – 2018)
  • Member (appointed), Shrewsbury Zoning Board of Appeals (April 2018 – present)
  • Member (elected), Shrewsbury Town Meeting (May 2018 – present)