Rob Mahon is a partner in the firm’s Corporate Services practice group focusing primarily on outside corporate counsel services and mergers and acquisitions. Rob’s clients include private and public companies; family offices, private equity firms and their portfolio companies; and startups and high-growth companies, for which he’s handled billions of dollars of transactions.

Acting as lead counsel for clients on over 100 multimillion-dollar acquisitions, Rob has significant experience counseling clients through all stages and types of mergers and acquisitions across a wide range of industries. Rob often leverages his substantial experience and his team at the firm for highly acquisitive businesses, regularly handling dozens of deals for clients at any time.

As outside counsel to companies and business owners, Rob provides holistic, practical and cost-effective approaches to accomplishing his clients’ goals. He counsels on a wide range of business matters, including commercial, finance and real estate transactions; mergers, acquisitions and restructurings; and corporate governance and compliance. Rob works hand-in-hand with his clients and their owners, board members and executives to handle these matters in addition to working with his team to handle a full range of other legal matters, including employment, securities, tax, litigation and intellectual property matters.

Rob has substantial experience in the Entrepreneurship Through Acquisition (ETA) space and helped launch the firm’s practice in this area, which offers aspiring entrepreneurs a unique opportunity to acquire and grow an existing business or series of businesses rather than starting a business from scratch.


  • Saint Louis University School of Law  (J.D., magna cum laude, 2017)
    • Order of the Woolsack
    • Alpha Sigma Nu Jesuit Honor Society
    • Saint Louis University Law Journal (Editor)
    • Dean’s Scholarship
    • Judge Robert G. Dowd, Sr. Appellate Advocacy Award (Top Oralist)
    • Academic Excellence Awards (Highest Grade): Property, Contracts II, Real Estate Transactions, Commercial Transactions, International Business Transactions, Alternative Dispute Resolution, and Advanced Legal Research
  • University of Missouri-St. Louis  (M.B.A., 2017)
    • Beta Gamma Sigma Honor Society
  • University of Missouri-St. Louis  (B.S.B.A., magna cum laude, 2013)
    • Emphasis in Finance
    • Financial Service Professionals (FSP) Excellence in Financial Education Award
    • Curators Scholar Award
    • Bright Flight Scholarship


  • Missouri

Charitable and Civic Involvement

  • Armstrong Teasdale United Way Campaign Committee
  • Armstrong Teasdale Michael C. Tramble Memorial Scholarship Fund Committee


  • Missouri/Kansas Super Lawyers®, Rising Star – Mergers and Acquisitions (2023)
  • Association for Corporate Growth (ACG), St. Louis – STL Emerging 20 (Class of 2022-2023)
  • St. Louis Small Business Monthly – 2023 Best Attorneys Honoree


Rob was a summer associate with the firm before joining full time. He also previously clerked for the Hon. Judge Philip D. Heagney in the 22nd Judicial Circuit Court of Missouri.

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