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About me

Marc J. Weinstein has served as lead trial counsel in 45 jury trials and more than 100 non-jury trials in a wide variety of civil and criminal cases in numerous state and federal courts. Marc represents and counsels companies and individuals in white collar criminal matters and complex civil business disputes throughout the country, with a special emphasis on cases involving fraud. Marc also manages and conducts internal and external investigations for corporate and institutional clients.

Marc has represented businesses and individuals under investigation for, or charged with federal and state criminal offenses and regulatory violations. His experience includes defending clients accused of federal tax offenses, money laundering, Bank Secrecy Act violations, securities violations, mortgage fraud, public corruption offenses and healthcare fraud, among others. His clients have included corporations, corporate officers and directors, elected officials, physicians, attorneys, and police officers. Marc has served as an appointed member of the Criminal Justice Act (CJA) Panel of the United States District Court for the Eastern District of Pennsylvania since 2008.

Marc's business litigation practice includes counseling and representing companies in a wide variety of commercial disputes, including but not limited to matters involving copyright infringement, unfair competition, trademark infringement, theft of trade secrets, patent infringement, UCC Article 2 claims, agency and distributor contract disputes, civil conspiracy, civil fraud, civil RICO, breach of fiduciary duty, director and officer liability, commercial and residential real estate development disputes, and defense of consumer protection claims and class actions. In addition to representing clients in federal and state courts across the country, Marc has represented numerous clients in arbitrations arising out of commercial contract disputes.

Part of Marc's practice includes representing publishers of secure, high-stakes examinations, to assist them in implementing legal protections and practical security measures to minimize cheating, strengthen the integrity of test results and enforce all intellectual property rights that may apply to their examinations.  In the course of representing test publishers in matters of this nature, Marc has conducted numerous extensive investigations to identify and hold accountable individuals who have cheated on secure tests and others who have aided and abetted cheating.  Test publishers include certifying professional specialty boards, professional licensing agencies, schools and universities.



Practice areas


  1. White Collar Crime: 50%
  2. Litigation: 25%
  3. Intellectual Property: 25%

Attorney endorsements

10 total 

Are you an attorney? Endorse this lawyer

  • Ergio I. Fernandez

    Mark was a mentor as a young Assistant State Attorney in Miami. He is superbly qualified in trial work and criminal law. I wholeheartedly recommend him.


    Ergio Fernandez Criminal Defense Attorney
    Relationship: Co-worker

  • Christian K. Lassen II

    I endorse this lawyer.


    Christian Lassen Personal Injury Attorney
    Relationship: Fellow lawyer in community

Contact info

Dilworth Paxson LLP

1500 Market St Ste 3500e
Philadelphia, PA, 191022101


FLMember in Good Standing199809/08/2015
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Roll of Honor for Pro Bono ServiceFirst Judicial District2008
The Robert Kanziger Human Rights AwardAnti-Defamation League2005
Work experience
TitleCompany nameDuration
AssociateBallard Spahr LLP2007 - 2012
OwnerMarc J. Weinstein, PA2005 - 2007
Of CounselBarclay Cale, PA2005 - 2007
PartnerBest & Associates, PA2002 - 2005
Assistant State AttorneyOffice Of The State Attorney, 11th Judicial Circuit1998 - 2002
Association namePosition nameDuration
Association of Test PublishersMember2012 - Present
Council on Licensure, Enforcement and RegulationMember2012 - Present
Temple American Inn of CourtMember2012 - Present
Philadelphia Volunteer Lawyers for the ArtsVolunteer Lawyer2007 - Present
Philadelphia Bar AssociationMember2007 - Present
Anti-Defamation LeagueAssociate National Commissioner2005 - 2007
American Bar AssociationMember1998 - Present
Legal cases
Case nameOutcome
American Board of Internal Medicine v. Arora Board Review, et al.Settled
Morilus v. Countrywide Home Loans, et al.Summary judgment granted in favor of client, dismissing all claims against lender and finding plaintiff liable for fraud counterclaim.
United States v. CONFIDENTIAL CLIENTNo charges filed against client.
See all legal cases 
School nameMajorDegreeGraduated
Temple University - James E. Beasley School of LawN/AJD - Juris Doctor1998
Speaking engagements
Conference nameTitleDate
Innovations in Testing 2013Truth and Consequences: Conducting Effective Test Security Investigations That Produce Admissible and Compelling Evidence for Later Use in Legal Proceedings2013
ABMS Annual Board Staff ConferenceBuilding a Bulletproof Exam Integrity Program2012