Senior Counsel

Michael L. Hermsen

Corporate & Securities, Capital Markets, REITs


Mike Hermsen has an extensive practice focused on securities matters, including the representation of issuers in securities offerings and liability management transactions; corporate clients in connection with disclosure, compliance, reporting and stock exchange matters; and boards of directors and management on corporate governance matters and executive compensation disclosures and reporting. He also is very active in thought leadership efforts on securities and capital market matters, including writing articles, participating in the development of industry white papers, chairing and speaking at conferences and bar association meeting and speaking with the media, where he has often been cited regarding new regulatory initiatives.

Before Mike joined Mayer Brown in 1994, he had extensive senior administrative experience with the US Securities and Exchange Commission in Washington DC. In the SEC's Division of Corporation Finance he served as Assistant Director (1992-1994), Special Counsel (1990-1992) and Attorney/Advisor (1986-1990). He also has accounting and audit experience with a then-Fortune 500 manufacturing corporation.

Mike has been included in The Best Lawyers in America in the practice areas of Securities/Capital Markets Law and Securities Regulation for over a decade. The Legal 500 US recommends Mike in Capital Markets: Equity Offerings, noting his "unsurpassed knowledge of SEC rules." The IFLR1000 has also ranked Mike as a “Notable Practitioner” since 2020, in the United States for Capital Markets: Debt and Capital Markets: Equity. 


  • University of Wisconsin Law School, JD
  • Marquette University, MBA
  • Marquette University, BS


  • Illinois
  • Wisconsin

Professional & Community Involvement

  • American Bar Association, Business Law Section
  • Illinois State Bar Association, Section of Corporations, Securities and Business Laws
  • State Bar Association of Wisconsin
  • Chicago Bar Association