Justin M. Holmes

Of Counsel

  • Office Contact Info
  • Biography

    Justin Holmes is Of Counsel practicing in the GRSM Philadelphia office. He has a national practice centered on defending organizations in class actions and other data privacy-related litigation, as well as handling regulatory investigations for clients from a wide breadth of industries in matters stemming from data privacy and security incidents. An experienced litigator, Justin has represented clients in federal district court, state court, and governmental tribunals throughout the country. He is well-versed in every stage of the litigation process.

    Prior to joining GRSM, Justin practiced at a boutique national cyber-security law firm in Pennsylvania and also in Washington, D.C. at two international law firms representing corporate clients in complex commercial actions nationwide, with a focus on class action litigation and regulatory and governmental investigations. He further honed his first-chair trial skills by serving as an Assistant District Attorney in the Philadelphia District Attorney’s Office’s Homicide and Major Trials Units where he took over 50 serious felony cases to trial. 

    While completing his J.D. at Wake Forest University School of Law, Justin was Captain of the National Trial Team and was also elected to the Order of the Barristers.

    In addition to his corporate civil practice, he has dedicated a great deal of time to pro bono work representing clients seeking asylum based on persecution in their home country including first-chairing a case before the Arlington Immigration Court to obtain asylum for an Afghan family of six.  

    Outside of the office, Justin is President of the Board of Directors for the Harrisburg Area Confirmation Camp and is also a Board member of a central Pennsylvania service organization – LutheranHands.


    U.S. District Court for the District of Columbia
    U.S. District Court for the Eastern District of Pennsylvania
    U.S. District Court for the Southern District of New York


  • Practice Areas
  • Representative Experience
    • Resolved a nationwide data breach class action matter for a national healthcare company with a putative class in the hundreds of thousands.
    • Represented one of the nation’s largest student loan servicers in a consolidated putative data breach class action matter comprised of more than 20 cases from around the country. 
    • Represented large financial institutions in complex class action lawsuits involving data breach claims and claims associated with the administration of their 401(k) plans.
    • Counseled a number of corporate clients through governmental and internal investigations. 
  • Publications & Presentations


  • Education


    J.D., Wake Forest School of Law, 2008

    • Order of the Barristers

    B.A., Medieval Studies and Political Science, Pennsylvania State University, 2005


    Super Lawyers “Rising Star: General Litigation” (2013-2014, 2016-2018)