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1601 Market Street
Suite 2600
Philadelphia, PA 19103
Phone: 215.825.8695
Fax: 215.825.8699
225 West 34th Street
14 Penn Plaza
New York, NY 10122
Phone: 646.787.1371
Fax: 215.825.8699
1 Thomas Cir NW – Industrious Thomas Circle
Suite 700
Washington D.C., 20005
Phone: 202-970-2642
Fax: 202-810-9031
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William A.


  • University of St. Thomas (MN) B.A. summa cum laude 1990
  • University of Minnesota School of Law, J.D. magna cum laude 1993


  • Pennsylvania
  • New Jersey

William A. Stock (Bill) is one of the country’s leading immigration lawyers. A founding member of Klasko Immigration Law Partners, LLP, he has practiced immigration law exclusively for over thirty years. His clients include small businesses, medium sized companies, and multinational corporations and their employees, as well as individual clients, investors and researchers.

Bill leads a team of thirty-two attorneys, senior and junior paralegals in obtaining employment-based immigration benefits for clients, such as nonimmigrant visa classification (H-1B, L-1, E-1 and E-2, TN and O-1); permanent residence or “green card” status through Labor Certification or as immigrants of Exceptional or Extraordinary Ability (EB-1, EB-2 and EB-3); investment-based immigration (EB-5); and unusual or complicated matters such as physician J-1 waivers, visas for entrepreneurs, and mandamus or APA review actions brought in federal court.

Bill served as President of the American Immigration Lawyers Association (AILA), the 16,000 member national organization of immigration lawyers in 2017.  He has long been active in the association on both a national and state level and has served several terms on the Association’s Board of Governors. In 2000, he received the Association’s Joseph Minsky Award for outstanding accomplishments in immigration law.

Bill is a Senior Editor of AILA’s annual Immigration & Nationality Law Handbook, and is the co-author of the “J Visa Guidebook” from Lexis Publishing.  He was an Adjunct Professor at the Villanova University School of Law.  He has been included since 2004 in Best Lawyers in America (Woodward/ White Inc.); since 2006 in Chambers Global: The World’s Leading Lawyers for Business (Chambers and Partners), Who’s Who in American Law, and The International Who’s Who of Business Lawyers.  Bill is also featured as a 20 top practitioner in the area of Immigration Law by Lawdragon

summa cum laude graduate of the University of St. Thomas (St. Paul, MN), (B.A.1990), he received his law degree from the University of Minnesota (J.D., magna cum laude, 1993) where he was a member of the Order of the Coif.

William's Practice Areas

  • The representation of multinational and domestic corporations, assisting with development and implementation of immigration programs to meet their talent management needs while ensuring employee satisfaction;
  • Representing employees as well as self-sponsored immigrant scientist and investors in obtaining and reaching their immigrant goals;
  • Representing companies and individuals in immigrant-related administrative and federal court litigation, including defense enforcement actions by the Departments of Labor and Homeland Security, and obtaining immigration benefits unlawfully withheld through federal court review of agency actions; and
  • Consultation and outreach services to community organizations, foreign student advisors, and to attorneys.
Bill Stock