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Andrew J. Mahon
Back to All Professionals
Andrew J. Mahon

York, PA

Lancaster, PA

Andy Mahon is an attorney in Barley Snyder’s Employment and Immigration practice groups with over a decade of experience. He concentrates his practice on immigration law, helping clients with a myriad of immigration related matters, including representing families and businesses seeking immigration benefits as well as defending individuals placed in removal proceedings. Andy has represented hundreds of clients before various agencies that are responsible for administering U.S. immigration laws, including the U.S. Citizenship and Immigration Services, the U.S. Department of Justice and the U.S. Department of State. He also litigates immigration cases in federal court, filing petitions for review and submitting oral arguments before the U.S. Court of Appeals for the Third Circuit, and preparing mandamus and habeas petitions before the U.S. District Court for the Middle District of Pennsylvania. He routinely advises attorneys from other areas of practice on immigration matters affecting their clients, often working with criminal defense counsel to structure guilty pleas to avoid future immigration consequences. Additionally, Andy has presented on immigration topics at several training courses for lawyers, paralegals and community members.

Before joining Barley Snyder, Andy worked at a Lancaster law firm focused exclusively on the practice of immigration law, becoming a partner in 2019. Prior to that, he was a staff attorney for the Pennsylvania Immigration Resource Center where he defended individuals in removal proceedings who were most in need due to mental illness, poverty or persecution in their country of origin. He started his legal career as a law clerk for the Honorable Penny L. Blackwell in the York County Court of Common Pleas.

Andy graduated from Fordham University with a bachelor’s degree in history and French. He then spent two years living in France and working as an English teacher. He earned his juris doctor from Widener University School of Law, graduating with honors. He was a member of the Moot Court Honor Society and Widener Law Journal.

  • American Immigration Lawyers Association
  • Light of Liberty Award, Pro Bono Attorney of the Year (2014)
  • “Human Resource Hot Topics,” PennAg (October 2023)
  • “Intro to Business Immigration and I-9 Compliance,” Lancaster Area Paralegal Association 8th Annual Civil Conference (September 2023)
  • “Immigration Law Training,” Mennonite Central Committee, Presenter (2013-2017)
  • “Model Hearing Program:  Withholding-Only Proceedings,” PIRC and York Immigration Court, Presenter (May 2014)
  • Former teaching assistant, Bordeaux, France
Andrew J. Mahon
  • Widener University School of Law, J.D.
  • Fordham University, B.A.
  • Pennsylvania
  • New Jersey
Community Involvement
Pennsylvania Immigration Resource Center

Volunteer lawyer and former board president

Volunteer Income Tax Assistance Program

Volunteer tax preparer

American Immigration Lawyers Association

Volunteer lawyer and former liaison committee member

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