O'Brien and Ryan, LLP - Attorneys at Law
Shannon Sweeney
Email: ssweeney@obrlaw.com
Main: (610) 834-6248
Fax: (610) 834-1749
Assistant: Sean Morrow
Email: smorrow@obrlaw.com
Main: (610) 834-6219

Shannon joined O’Brien and Ryan, LLP in 2022, where his practice concentrates on medical malpractice defense. Prior to joining O’Brien & Ryan, Shannon was an Assistant District Attorney in Philadelphia, where he prosecuted a wide range of violent felony and misdemeanor crimes, including assault, attempted murder, drug dealing, DUI, illegal gun possession, reckless endangerment, robbery, and theft. Shannon was a fierce advocate on behalf of the city’s victims and brings invaluable trial experience to O’Brien & Ryan, having conducted over 50 trials and over 200 preliminary hearings. He also mentored and trained over 70 law school interns, newly hired attorneys, and police officer recruits on proper investigation documentation and trial preparation.

Prior to law school, Shannon served in the United States Navy as a Surface Warfare Officer, where he deployed to Asia and the Middle East in various roles on the ships USS Benfold (DDG 65), USS Peleliu (LHA 5) and USS Green Bay (LPD 20). Shannon continues his service today in the Navy Reserve, currently with the rank of Lieutenant Commander, and as the Executive Officer of a 100-person ship maintenance unit out of Naval Reserve Center Fort Worth, Texas. Prior to starting his legal career, he deployed to the Headquarters Staff of the Commanding General of U.S./NATO forces in Kabul, Afghanistan.

In addition to his zealous advocacy for our clients and military service, Shannon continues to support his local community. He volunteers on the Board of Trustees for Hope Partnership for Education, a co-ed middle school and adult education program in North Philadelphia.

Practice Areas:

Bar Admissions:

  • Pennsylvania, 2018


  • Temple University Beasley School of Law, Philadelphia, Pennsylvania, 2018, J.D.
    • Rubin Public Interest Honor Society Fellow
  • The College of the Holy Cross, Worcester, Massachusetts, 2008, B.A.
    • NCAA Division 1 Men's Varsity Swimming and Diving Team
      • Co-Captain for 2007-08 season

Professional Associations and Memberships:

  • Pennsylvania Bar Association
  • Philadelphia Bar Association

Published Works:

  • Rocks v. Islands: Natural Tensions Over Artificial Features in the South China Sea, Temple International and Comparative Law Journal, Volume 31, Number 2 (Fall 2017)

Hickory Pointe
2250 Hickory Rd, Suite 300
Plymouth Meeting, PA 19462
Phone: (610) 834-8800
Fax: (610) 834-1749