Mark Lennon is a tax attorney in Holland & Knight's Nashville office. Mr. Lennon assists clients with Employee Retirement Income Security Act (ERISA) issues in numerous types of corporate transactions, including mergers, acquisitions, add-ons, divestitures, carve-outs and joint ventures. Mr. Lennon guides clients through complex employee benefits matters, including controlled group considerations, 401(k) plan design and compliance, health and welfare plans, retirement plans and Affordable Care Act (ACA) issues. His experience also includes identifying and resolving post-transaction issues and preparing IRS and U.S. Department of Labor (DOL) voluntary compliance filings.

Previously, Mr. Lennon gained valuable experience as an associate at an international law firm in its Chicago office and a tax consultant in the Chicago office of a Big Four accounting firm.

Representative Experience

  • Represented Newport Healthcare, the national leader in treating higher-acuity mood and co-occurring disorders in teens and young adults, in its acquisition of Minnesota-based PrairieCare, a premier provider of mental health services in the Midwest with one of the nation's largest pediatric psychiatric practices. The firm continues to assist the client with general counsel by providing attention to regulatory and diligence matters, reviewing and preparing purchase agreements, and more


  • Loyola University Chicago School of Law, J.D., magna cum laude
  • Marquette University, B.S., cum laude
Bar Admissions/Licenses
  • Tennessee
  • Illinois
Honors & Awards
  • The Best Lawyers in America guide, Ones to Watch, Employee Benefits (ERISA) Law, 2022-2024