Thomas A. Gilson

Thomas A. Gilson

"Like music, law requires patience, practice and creativity. My background as a concert pianist prepared me for the challenges of my legal practice."

(480) 429-3011



  • Commercial Contract Disputes
  • Complex Commercial Litigation
  • E-Discovery/Data Management
  • Financial Services Industry Litigation
  • Professional Malpractice
  • Securities


  • Northwestern University School of Law – J.D., 1993

    • Adlai E. Stevenson III Award for Best Brief, Julius Miner Moot Court Competition
    • Lowden-Wigmore Prize for Legal Scholarship
    • Executive Editor, Journal of Criminal Law and Criminology
  • The Julliard School – M.M., Piano Performance, 1987

  • Harvard College – A.B., Cum Laude, 1985

    • John Harvard and Harvard College Scholarships for Academic Achievement


  • United States Supreme Court

  • Supreme Court of the State of Arizona

  • Supreme Court of Illinois (inactive)

  • District of Columbia Court of Appeals (inactive)


  • Ranked AV® Preeminent™ by Martindale Hubbell

    *AV® Preeminent ™ and BV® Distinguished™ are certification marks of Reed Elsevier Properties Inc., used in accordance with the Martindale-Hubbell certification procedures, standards and policies

Biography & Background

Thomas Gilson is a Member of Beus Gilbert, representing clients in a wide range of commercial disputes. Mr. Gilson is an experienced trial attorney, handling multi-million dollar lawsuits involving financial fraud, professional liability claims, insurance coverage disputes and other complex litigation matters. He has extensive experience counseling clients in e-discovery and data management and has litigated and negotiated technical issues regarding the preservation and spoliation of evidence.  He is recognized by his peers as an AV® Preeminent Lawyer with the highest rating in Martindale-Hubbell.

Prior to joining Beus Gilbert, Mr. Gilson was a partner in a major Phoenix firm where his practice included class action suits and representation of clients in government agency investigations.  He was also an associate in an international law firm’s Washington, D.C. office and served as a law clerk to the Honorable Thomas A. Flannery of the U.S. District Court, District of Columbia (1995 to 1997) and the Honorable David B. Sentelle of the U.S. Court of Appeals, District of Columbia Circuit (1997 to 1998).

Mr. Gilson is an active member of the American Bar Association’s Section of Litigation, serving in the Section’s leadership for nine years. He is the recipient of two awards from the ABA: Outstanding Subcommittee Chair and Outstanding Newsletter Editor.

A graduate of the Juilliard School, Mr. Gilson is an accomplished classical pianist who has performed at New York’s Lincoln Center and throughout the country.

  • Representative Matters

    • Represented plaintiffs in major accounting fraud litigation in the Southern District of New York
    • Represented plaintiffs in multi-million dollar insurance coverage dispute, including jury trial
    • Represented plaintiffs in multi-million dollar legal malpractice case
    • Litigated and negotiated technical issues regarding the preservation and spoliation of evidence
    • Tried six-week jury trial involving competing claims for breach of contract relating to complex engineering project
    • Represented a class of plaintiffs in a major legal malpractice class action, overseeing all discovery and class certification issues
    • Represented defendants in multiple class action cases, overseeing all issues relating to settlement and claim administration
    • Extensive experience with removal of class action cases
    • Represented major broker-dealer in SEC insider trading investigation
    • Represented broker-dealer in bench trial involving dispute with an employee
    • Defended a chain of nursing homes in a grand jury investigation; defeated government’s attempt to invoke the “crime fraud” exception to the attorney­ client privilege
    • Managed the preservation, collection, production and review of millions of pages of electronic data in a complex breach of contract case
    • Litigated issues relating to the preservation and production of electronic data
  • Publications

    • Author, “Updating Federal Procedures for Removal and Venue: The Jurisdiction and Venue Clarification Act of 2011,” ABA Commercial Tort Newsletter, May 2012
    • Co-Author, “Ninth Circuit Approves Preliminary Denial of Class Certification,” ABA Class Actions and Derivative Suits Website, March 2010
    • Co-Author, “Seek and Ye Shall Find?” American Lawyer (E-Discovery Supplement), December 2008
    • Co-Author, “Internal Investigations: Ten Ways to Avoid Inadvertent Disclosure of Confidential Information,” American Bar Association, Criminal Litigation Committee Website, October 2008
    • Author, “Federal Rule of Criminal Procedure 32(h): R.I.P.,” American Bar Association, Criminal Litigation Committee Website, October 2008
    • Author, “Unpacking the Act of Production Doctrine,” Criminal Litigation Newsletter, Winter 2005
    • Author, “Making Sense of Booker/Fanfan,” American Bar Association, Litigation Section Website; Criminal Litigation Newsletter, Spring 2005
    • Author, “Federal Sentencing Guidelines: The Requirement of Notice for Upward Departure,” published in volume 82 of the Journal of Criminal Law and Criminology (1992)
  • Professional Affiliations

    American Bar Association, Section of Litigation

    • Member, Regional Meetings Committee (assisting Section of Litigation Committees in providing legal education programming for their members) (2015-present)
    • Member, Roundtable Committee (assisting Section of Litigation Committees in providing legal education programming for their members) (2012-2015)
    • Member, Advanced Planning Leadership Committee (assisting Section of Litigation Committees in sharpening and achieving their goals) (2010-12)
    • Co-Chair, Criminal Litigation Committee (2007-10)
    • Editor-in-Chief, Criminal Litigation Newsletter (2005-07)

    American Bar Foundation, Fellow

    National Institute for Trial Advocacy

    • Faculty, NITA deposition training program

    Board of Directors, Harvard Club of Phoenix

    • Interview and evaluate applicants for Harvard College

    Northwestern Law School

    • Interview and evaluate applicants to the law school
  • Community Involvement

    Board of Directors, Phoenix Symphony, 2007-2009