About Jonathan L. Marks

Jonathan Marks helps clients — often large insurers — develop investigation, claims handling and litigation strategies to detect, prevent and deter fraud. As an Assistant US Attorney, Jonathan tried numerous federal jury trials and argued appeals before the US Court of Appeals. As a lawyer in private practice, Jonathan has handled hundreds of insurance fraud investigations and dozens of fraud litigation matters. At every stage of counseling, investigation, litigation and in court, Jonathan helps his clients position themselves to find resolutions and obtain the outcomes they seek.

AUSA perspective and experience in high-stakes fraud investigations and litigation

Jonathan represents major health, workers' compensation and property and casualty insurers across the country who are trying to prevent fraud and address fraudulent claims. He counsels clients on effective claims strategies to reduce exposure to fraudulent claims and develop litigations strategies to recover payments obtained by fraud and deter future fraudulent conduct. Jonathan also represents clients in criminal matters and in preventing and while undergoing government investigations and represents corporations performing their own internal investigations. Jonathan's experience includes a variety of business litigation matters, anti-fraud counseling and litigation, white-collar criminal defense, compliance, internal investigations and civil litigation.

Before joining Katten, Jonathan served more than five years in the US Attorney's Office for the Northern District of Indiana, where he received a Director's Award for Superior Performance. As an AUSA, Jonathan handled a wide range of matters, including public corruption, tax evasion, RICO, money laundering, bank fraud, insurance fraud and embezzlement of employee pension and benefit funds. He tried many federal jury trials and argued appeals before the US Court of Appeals. He also headed the Northwest Indiana Public Corruption Task Force, an interagency group targeting public corruption in Indiana, and prosecuted a number of prominent public officials.

Jonathan began his legal career as a federal appellate court clerk for Judge Collins Seitz of the US Court of Appeals for the Third Circuit and then joined another large law firm in Chicago, where he acquired significant experience in civil litigation representing major corporations, commercial banks and other business entities and individuals in civil litigation in federal and state courts.

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Practice Focus

  • Insurance and health care fraud
  • Fraud investigations and litigation
  • RICO actions and litigation
  • Business litigation
  • White-collar investigations and criminal defense
  • Internal investigations

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Publications

Presentations and Events

Practices
Industries
Education
  • University of Michigan Law School, JD, magna cum laude, Order of the Coif
  • Yale University, BA, magna cum laude
Bar Admissions
  • Illinois
  • New York
Court Admissions
  • US Court of Appeals, Third Circuit
  • US Court of Appeals, Seventh Circuit
  • US District Court, Northern District of Illinois
  • US District Court, Southern District of Illinois
  • US District Court, Northern District of Indiana
  • US District Court, Eastern District of Wisconsin
  • US District Court, Western District of Wisconsin
  • US District Court, Eastern District of Michigan
Recognitions
Recognized or listed in the following:
  • Best Lawyers in America
    Criminal Defense: White-Collar, 2020–2025
  • BTI Client Service All-Stars
    2020
Award Methodologies