Co-chair of the Employee Benefits Litigation Practice Group, Deidre A. Grossman has extensive experience defending plan sponsors, fiduciaries and service providers in a wide range of ERISA cases across the country, in both single plaintiff and class actions.  

The breadth of Deidre's practice is apparent from the nature of the lawsuits she has handled in which favorable outcomes were recently obtained, including:

  • A putative class action alleging ERISA breach of fiduciary duty based on alleged misrepresentations about pension benefits, where the Second Circuit affirmed summary judgment
  • A putative class action by former employees on medical leave advancing ERISA benefit and Section 510 claims, which was dismissed without discovery in a case of first impression
  • Parallel 401(k) "stock drop" suits, one by an independent fiduciary and one by the U. S. Department of Labor, involving complex company securities, which were resolved through settlement after years of significant discovery and motion practice
  • A declaratory judgment action brought by fund trustees to enjoin a withdrawal liability arbitration commenced by an employer  

She also has represented plan sponsors and fiduciaries in matters involving:

  • Pension plan terminations
  • Prohibited transaction allegations
  • Claims for improper denial of benefits
  • Claims advanced by independent contractors
  • Challenges to the modification and termination of retiree benefits
  • State law claims preempted by ERISA

When she is not litigating, Deidre counsels clients on how to administer their employee benefit plans with a view to avoiding litigation under ERISA's fiduciary and disclosure provisions. Deidre is a contributing author for The Benefits Law Journal and a rewrite and contributing author for Employee Benefits Law, a publication of the Employee Benefits Committee of the American Bar Association.

In 2001, Deidre relocated to London, where she qualified as a Solicitor in England and Wales and practiced U. K. pensions law/litigation at one of the “Magic Circle” firms. She resumed her ERISA litigation practice in the U. S. in 2005.

Professional & Community Affiliations


Employee Benefits Committee, Labor and Employment Law Section

American Bar Association


Named, The Best Lawyers in America©

2014 and 2015

Publications & Press

ERISA Section 502(a)(3): “Safety Net” or “Trap” for Recipients of Mistaken Misrepresentations – Courts Continue to Weigh In

Bloomberg Law Reports, Vol. 4, No. 9

April 26, 2011

Going to the Courts with Scriveners Errors: The Limits of ERISA’s Plan Documents Rule

Benefits Law Journal, Vol. 24, No. 1

Spring 2011

Life After Glenn: Preparing for Conflict Discovery

BNA Pension & Benefits Daily

June 30, 2010

Second Circuit Holds Taft Hartley Funds Are Inherently Conflicted When Making Benefit Determinations

Bloomberg Law Reports, Vol. 3, No. 15

June 19, 2010

The Latest Uncertainty in Benefit Claim Litigation – The Proper Scope of Conflict Discovery After Glenn

Bloomberg Law Reports, Vol. 3, No. 8

April 12, 2010

Are Unpaid Employer Contributions to an ERISA Plan "Plan Assets"?

Benefits Law Journal, Vol. 22, No. 4

Winter 2009

Speaking Engagements

2014 Employee Benefits Summit

Atlanta, GA

June 19, 2014

Steering Clear of Benefits Litigation through Better Document Drafting

The 2012 Executive Employer® Conference

Littler Mendelson, Scottsdale, AZ

May 10, 2012

ERISA’s Evolving Duty to Disclose – Benefits Litigation Hazards and How to Manage Them

The Conference Board, New York, NY

June 21, 2011

Pressing Issues Facing 401(k) Plan Administrators in 2011: 404(c), Service Agreements, IRS/DOL Audits, Litigation Risks and Other Nuts and Bolts

Littler’s Employee Benefits Summit, Chicago, IL

May 3, 2011

401(k) Fees: Litigation, Regulation and Compliance

The Executive Employer Conference, Phoenix, AZ

April 7, 2011

New York Benefits Summit

New York, NY

February 10, 2011

Will Your Advice Be Protected? Ethical Considerations for Those Advising About Benefits – the Fiduciary Exception to the Attorney-Client Privilege and More

Littler’s Employee Benefits Summit, New York, NY

February 10, 2011


  • J.D., University of Pennsylvania Law School, 1993 cum laude
  • B.A., University of Pennsylvania, 1988


  • Italian

Bar Admission

New York


  • U.S. Court of Appeals, 2nd Circuit
  • U.S. Court of Appeals, 3rd Circuit
  • U.S. District Court, Northern District of New York
  • U.S. District Court, Eastern District of New York
  • U.S. District Court, Western District of New York
  • U.S. District Court, Southern District of New York