Jason E.Cellier


Columbus + 1.614.281.3817

Jason Cellier represents clients in a wide range of complex commercial litigation matters, including high-stakes investigations and government enforcement proceedings. He has represented clients in the petroleum, health care, energy, and insurance industries.

Jason has significant experience defending some of the nation's largest companies in multijurisdictional and multiparty matters, including class action civil litigation, antitrust, and consumer protection lawsuits. He is currently defending a Fortune 100 company facing multiple class actions in federal and state courts, as well as a government investigation, related to the distribution of opioid medications. Jason recently played a pivotal role in securing the dismissal of antitrust and consumer protection claims brought by the Commonwealth of Kentucky Attorney General against Marathon Petroleum Corporation.

Jason also has significant experience conducting and managing government and internal investigations. He recently represented a multistate health care system in an investigation and provided advice to the board and board subgroup regarding the practices of hospital staff and leadership.

Jason maintains an active pro bono practice and has represented immigrants seeking asylum in the United States.

Prior to joining Jones Day, Jason served as a law clerk on the United States District Court for the Eastern District of Kentucky. He is active in his church.


  • Universities defend multidistrict putative class action litigation brought by former football playersJones Day is serving as lead counsel for all NCAA member institution defendants in a multidistrict litigation ("MDL") consolidating more than 500 putative class actions brought on behalf of former football players.
  • Marathon secures Daubert and summary judgment wins dismissing Kentucky AG's antitrust claimsJones Day secured dismissals on behalf of Marathon Petroleum Corporation ("Marathon Corp."), Marathon Petroleum Company, LP ("MPC LP"), and Speedway LLC ("Speedway," and collectively, "Marathon") in an antitrust suit brought by the Commonwealth of Kentucky seeking more than $173.6 million in damages related to the sale of reformulated gasoline ("RFG") in Louisville and Northern Kentucky (collectively, "NKY").
  • Hospital system conducts investigation of circumstances leading to criminal prosecution of employeeJones Day was retained by a multi-state health care system to conduct an investigation and advise the board regarding the practices of hospital staff and leadership regarding a sensitive issue that resulted in a criminal prosecution of an individual who worked at the hospital.
  • Insurance company obtains dismissal in putative class actions asserting Medicare secondary payer claimsJones Day obtained dismissals on behalf of an insurance company in two related putative class actions brought in the Southern District of Ohio alleging liability under the Medicare Secondary Payer provision of the Medicare Act.
  • Jones Day client receives commutation of sentence from President ObamaOn Tuesday, November 22, 2016, the U.S. Office of the Pardon Attorney notified a Jones Day team that President Obama had granted their client’s clemency petition.