Gregory J. Ossi

Phone: (202) 230-5393 (202) 230-5393


Gregory J. Ossi advises his clients on ERISA litigation and labor law matters. He regularly counsels employers on a broad range of employee benefits matters, with an emphasis on multiemployer pension liability, including withdrawal liability issues and claims, as well as other health plan issues.

In addition to his work in the employee benefits area, Greg counsels and litigates disputes regarding union organizing, unfair labor practice charges, and labor issues arising from mergers, acquisitions and bankruptcy. Greg’s clients come largely from the energy production and coal mining sectors, defense contracting and construction.

Greg has arbitrated issues in labor and employee benefit matters and litigated labor and ERISA cases in federal courts in the District of Columbia, Illinois, Kentucky and Virginia. He has extensive experience with retirement and health care plans pursuant to collective bargaining agreements. Greg has given numerous presentations across the country on various issues that arise from participation in a multiemployer pension plan. Prior to his career in law, Greg was a certified public accountant with one of the Big Four accounting firms.


  • Challenged multiemployer pension plan withdrawal liability assessments on the basis of actuarial assumptions, construction exemption, timeliness, evade or avoid and common control.
  • Represented companies as special labor counsel and as special benefits counsel in addressing collectively bargained obligations, multiemployer pension liability and retiree health benefits under Sections 1113 and 1114 of the Bankruptcy Code.
  • Worked with medical providers and unions to create drug formularies that reduce prescription drug costs for employers while still providing a valuable benefit to employees.
  • Led the effort to completely restructure an employer's health plans, including health and sickness, dental, and prescription drug benefits for more than 4,000 employees and retirees.
  • Negotiated vendor contracts for a client with more than 50 vendors and more than 300 health and welfare plan designs.
  • Handled the delinquent contribution and withdrawal liability claims from 40 multiemployer pension plans as special benefits counsel to leading packaged food company during its bankruptcy.
  • Advised an employer in its assumption of $2.4 billion worth of long-term union and coal mining liabilities as part of its largest acquisition.


Chambers USA, Virginia (Band 3), Labor and Employment (2009−2014)
Chambers USA, Virginia (Up and Coming), Labor and Employment (2007)
Best Lawyers®, Litigation - Labor and Employment (2020)

Awards Methodology (


Bar Admissions

  • District of Columbia
  • Maryland
  • Virginia


  • Catholic University of America, Columbus School of Law, J.D., 1997, magna cum laude; Executive Editor, Journal of Contemporary Health Law and Policy; ABA/BNA Award for Outstanding Achievement in Labor and Employment Law
  • University of Virginia, M.S., 1991
  • Washington and Lee University, B.S., 1990

Court Admissions

  • U.S. Court of Appeals, Fourth Circuit


  • American Bar Association, Co-chair, Jointly Administered Plans Subcommittee of the Employee Benefits Committee of the American Bar Association Section of Labor and Employment Law
  • American Bar Association, former co-chair of the Multiemployer Withdrawal Liability Subcommittee of the American Bar Association Section of Labor and Employment Law