Michael Gilligan is an accomplished corporate lawyer and trusted business advisor who is exceptionally skilled at helping private and public companies navigate through the complex transactions they face throughout their business lifecycle. Mr. Gilligan has built a substantial practice over the past 24 years, with national and multinational company clients turning to him for strategic legal counsel, including in connection with domestic and cross-border mergers, acquisitions, dispositions, private placements and restructurings.

As part of his corporate, private equity, and mergers and acquisitions practice, Mr. Gilligan represents clients in a wide variety of transactions and across industries. In particular, he has exceptional experience handling buy-side and sell-side M&A transactions, joint ventures, proxy contests and general corporate governance matters.

Drawing upon his deep knowledge and experience, Mr. Gilligan advises large corporations, financial sponsors and financial advisors. He represents these clients in a range of matters involving corporate finance, corporate governance and disclosure, mergers and acquisitions, and other corporate and financial transactions.

Before joining WilmerHale, Mr. Gilligan was a partner in the New York City office of another international law firm, where he focused on public and private merger and acquisition transactions.


  • Named a leading lawyer for Corporate/M&A by Chambers USA with sources saying he “is a ‘very smart guy’ who is well thought-of by peers for his broad-based M&A practice, including acting for private equity clients and financial advisors”
  • Recommended by The Legal 500 United States for M&A and corporate law

Insights & News


  • Education

    • JD, Fordham University School of Law, 1997

    • BS, Biomedical Engineering, Johns Hopkins University, 1992

  • Admissions

    • New York