Michael J. Diamondstein

Location: Philadelphia, Pennsylvania
Phone: 215-940-2700
Fax: 215-940-2701
Email: [email protected]

1012046_1When you feel the intense heat of a Government investigation or you have been charged with a crime, you need a lawyer who is not afraid to stand up for you. You need a lawyer who has been there. Michael J. Diamondstein has been there for athletes, politicians, police officers and every day working Americans.

Mr. Diamondstein is a member of the Pennsylvania, New Jersey and federal Bars who has handled approximately 20,000 criminal cases in state and federal courts throughout the United States. He has defended high-profile, media-sensitive cases as well as serious but unreported criminal cases. He has secured acquittals and dismissals for hundreds and hundreds of his previous clients. He is well respected in the legal community as he routinely represents clients who have been referred to him by judges, prosecutors, law enforcement officers and fellow attorneys.

Mr. Diamondstein’s vast experience and demonstrated skill have led him to be named to Super Lawyers since 2011; one of the Top One Hundred Pennsylvania Trial Attorneys by the National Trial Lawyers Association; and he has received the highest AV Preeminent rating from Martindale-Hubbell. He is also qualified to handle death penalty cases under Pennsylvania Rule 801. Mr. Diamondstein is often asked to lecture to other lawyers at legal education seminars. This same level of experience and skill enables him to provide the highest standard of representation for anyone accused of crimes, under investigation or recently arrested.

Michael J. Diamondstein is a lifelong resident of the Philadelphia metropolitan area. A graduate of Ithaca College, Mr. Diamondstein attended Widener University School of Law, from which he graduated summa cum laude.

Areas of Practice

Bar Admissions and Pro Hac Vice Appearances

  • Pennsylvania
  • New Jersey
  • U.S. District Court, Eastern District of Pennsylvania
  • U.S. District Court, Middle District of Pennsylvania
  • U.S. District Court, District of New Jersey
  • U.S District Court, Maryland
  • U.S. District Court, Eastern District of Tennessee
  • U.S. District Court, Eastern District of New York
  • U.S. District Court, Delaware
  • U.S. District Court, Western District of Missouri
  • U.S. Court of Appeals 3rd Circuit
  • Supreme Court of the United States of America


  • Widener University School of Law, Harrisburg, Pennsylvania
    Honors: summa cum laude
  • Ithaca College


  • Instructor for Pennsylvania Bar Association CLE courses
  • Instructor, National Institute of Trial Advocacy
  • Expert Witness in the field of Criminal Defense

Honors and Awards

  • Selected to Super Lawyers, 2011 to present
  • AV Preeminent Rated by Martindale-Hubbel in Legal Ability and Ethical Standards
  • Selected as a Top 100 Trial Lawyer by The National Trial Lawyers Association 2007 to present
  • Wolcott Fellow

Professional Associations and Memberships

  • Pennsylvania Bar Association, Member
  • National Association of Criminal Defense Lawyers , Life Member
  • Pennsylvania Association of Criminal Defense Lawyers
  • The Philadelphia Criminal Law American Inn of Court, Master

Past Employment Positions

  • Philadelphia District Attorney’s Office, Assistant District Attorney, Major Trials Unit