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D. Aaron Rihn Photo
  • Bio

D. Aaron Rihn


As a Partner at Robert Peirce & Associates, Aaron Rihn leads the firm in complex litigation matters, including class actions, wage and hour collection actions, pharmaceutical cases, civil rights cases, and other product liability cases, as well as appellate matters. He infuses his passion for the law into every case, allowing him to strongly resonate with a jury.

Over the course of his career, Aaron has helped his clients recover in excess of $50 million in verdicts and settlements. He has tried cases to verdict in both Pennsylvania and West Virginia and has argued before a number of the highest appellate courts, including both the 3rd Circuit Court of Appeals and 9th Circuit Court of Appeals.

Aaron is a consummate leader in his field and was appointed as the co-liaison counsel in the CPAP MDL, as well the Plaintiffs’ Steering Committee in East Palestine Train Derailment MDL and the Federal Prempro MDL. He has been selected as a Top 100 Trial Lawyer and to the Top 40 Lawyers Under 40 by the National Trial Lawyers Association, as well as named a Pennsylvania Super Lawyer. He is a member of the Million Dollar Advocates Forum, the Multimillion Dollar Advocates Forum, the American Bar Association, Pennsylvania Bar Association, American Association for Justice, Western Pennsylvania Trial Lawyers Association and Allegheny County Bar Association.

Aaron attended Grove City College, where he received his Bachelor of Arts in Literature, and then graduated from the University of Richmond T.C. Williams School of Law. He grew up in Tarentum, PA, a mill town just north of Pittsburgh. Like many other working parents, his free time is spent hopping from extracurricular activity to extracurricular activity with his three children, and he loves every second of it.

Bar Admissions

  • Pennsylvania, 2000
  • West Virginia, 2001
  • U.S. District Court Eastern District of Pennsylvania, 2001
  • U.S. District Court Western District of Pennsylvania, 2000
  • U.S. District Court Northern District of West Virginia, 2004
  • U.S. District Court Southern District of West Virginia, 2001
  • U.S. Bankruptcy Court Eastern District of Pennsylvania
  • U.S. Bankruptcy Court Western District of Pennsylvania
  • U.S. Court of Appeals 3rd Circuit, 2005
  • U.S. Supreme Court, 2006
  • U.S. District Court Middle District of Pennsylvania, 2014
  • U.S. Court of Appeals 9th Circuit
  • U.S. Court of Federal Claims


  • University of Richmond, The T.C. Williams School of Law, Richmond, Virginia
    • J.D. cum laude - 2000
  • Grove City College, Grove City, Pennsylvania, United State of America
    • B.A. - 1997
    • Major: Literature

Honors and Awards

  • Super Lawyer, 2022-2024
  • Super Lawyers Rising Star, 2011 - 2014
  • Top 40 Lawyers Under 40, National Trial Lawyers, 2012-2024
  • Top 100 Trial Lawyers, National Trial Lawyers

Professional Associations and Memberships

  • American Bar Association
  • Pennsylvania Bar Association
  • American Association for Justice
  • Western Pennsylvania Trial Lawyers Association
  • Allegheny County Bar Association

Representative Cases

  • In re Prempro, 230 F.R.D. 555 (ED. Ark 2005)
  • Slivo v. City of Pittsburgh Municipal Pension Fund, 882 A.2d 24 (Pa. Cmmwlth 2005)
  • Sexton v. Grieco, 613 S.E.20 81 (W. Va. 2005)
  • Ashbury-Castro-GlaxoSmithKline, 352 F.Supp. 729 (N. D. W. Va. 2005)
  • Virden v. Altria Group, Inc., 304 F.Supp.2d.832 (N. D. W. Va. 2004)
  • In re West Virginia Asbestos Legislation, 592 S.E.2d 818 (W. Va. 2003)
  • Swierkowski v. Consolidated Rail Corp., 168 F.Supp.2d 389 (ED. Pa. 2001)
  • Grammer v. Kane, 570 F.3d 520 (3d Cir. 2009)