The Wagner Law Group | Est. 1996

Sophisticated Legal Solutions Boutique-Style Service


Ari Sonneberg has been with The Wagner Law Group since 2001, specializing in the fields of ERISA and employee benefits. Ari advises and represents clients with respect to design, compliance and all other aspects of qualified and non-qualified employee benefit plans. He has extensive experience in drafting, designing, amending, and restating qualified and non-qualified employee benefit plans and related trusts, including money purchase pension plans, profit sharing plans, 401(k) plans, defined benefit plans, welfare benefit plans, medical expense reimbursement plans, 403(b) plans, and nonqualified deferred compensation plans. Ari frequently advises clients concerning government filings and correction programs associated with the Internal Revenue Service, the Department of Labor, and the Pension Benefit Guaranty Corporation.

Additionally, Ari has also advised clients on terminating qualified defined benefit and defined contribution plans, including orphaned plans and plans under bankruptcy trustees. He also consults on matters such as HIPAA compliance in relation to employee benefit plans and has represented clients through governmental audits and subsequent negotiations with the Internal Revenue Service and the Department of Labor. Ari also has significant experience drafting and reviewing qualified domestic relations orders (QDROs) with respect to the divorce-related division of retirement plan assets.

Prior to joining The Wagner Law Group, Ari was an associate in the Boston office of a prominent national law firm where he reviewed and analyzed commercial ground leases, analyzed issues relating to insurance, condemnation, assignment, subletting, percentage rent, use restrictions and operating covenants, termination rights, environmental conditions and liability issues. He also analyzed and made recommendations with respect to appropriate provisions for subordination, non-disturbance and mutual attornment rights as affecting ground lessors, ground lessees, subtenants and leasehold mortgagees.

Ari also served as a law clerk to the Honorable Charles E. Ramos, Supreme Court, New York County, Commercial Part.


Publications & Media

Classes & Seminars

  • Dewan and Beyond – The Creation, Codification, and Implementation of QDROs 2024 – Panelist, Pennsylvania Bar Institute CLE webinar, February 27, 2024
  • "Termination of Tax-Qualified Defined Contribution Retirement Benefit Plans," (PDF) UBS Financial Services Seminar, August 5, 2011 (Palm Beach Gardens, Florida)
  • "Advising Your Clients Regarding Small Business Retirement Plans," October 2002, Massachusetts Bar Association (Boston, MA) – Program chair and speaker
  • "ERISA: Pension Plan Development and Administration in Massachusetts," November 2002 – Speaker
  • "Retirement Planning for You and Your Clients," June 2004, Massachusetts Bar Association (Boston, MA) – Speaker
  • "Drafting Legal Documents," September 2004, Stonehill College (Easton, MA) – Health Care Administration Law course – Guest speaker

Television Appearances


  • Brooklyn Law School, Brooklyn, New York
    • Juris Doctor - 06/2000
  • CUNY Queens College, Flushing, New York
    • B.A., Bachelor of Arts - 02/1997
    • Honors: magna cum laude
    • Honors: Dean's List (all semesters)
    • Honors: Honors in Political Science
    • Honors: Golden Key National Honor Society
    • Honors: Business and Liberal Arts Honors Program – Student Representative
    • Major: Political Science

Bar Admissions

  • U.S. District Court District of Massachusetts
  • Massachusetts

Professional Associations

  • Massachusetts Bar Association – Appointed to Taxation Law Section Council (2001 - Present) and Chair of the ERISA Section Practice Group, Massachusetts Bar Association (2001 - 2005)
  • American Bar Association


  • Rising Star Award, New England Super Lawyers Magazine
  • Marquis Who's Who: Who's Who in America - As of 2020


  • Hebrew

Past Positions

  • Day, Berry & Howard, Boston, MA, Attorney, 2000 to 2001
  • Rosenfeld & Maidenbaum, Cedarhurst, NY, Legal Assistant, 1995 to 2000
  • Honorable Charles E. Ramos, Supreme Court, New York County, Commercial Part, New York, NY, Law Clerk, 1998

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