Atty. 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.
Criminal Defense: White-Collar Attorney · Serving Chicago, IL
Profile Summary
About Jonathan L. Marks at a Glance
Jonathan L. Marks is a criminal defense and white collar attorney based in Chicago, Illinois, practicing at Katten. Educated at The University of Michigan Law School (J.D., 1989). Recognitions include Best Lawyers in America — Criminal Defense: White-Collar (2026). Serves clients in Chicago, IL and the surrounding metropolitan area.
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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
- 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
Practice Areas Explained
Jonathan L. Marks's Areas of Legal Practice
Each practice area below reflects the types of cases Jonathan L. Marks handles, with a practical overview of what that area of law involves and how it may apply to your situation in Chicago.
Criminal Defense in Chicago
A criminal defense attorney protects your rights from arrest through trial. Find experienced lawyers handling DUI, drug, federal, theft, and violent-crime charges.
Jonathan L. Marks is one of 212,605 criminal defense attorneys indexed nationally. Browse criminal defense attorneys in Illinois →
White Collar Crimes in Chicago
Jonathan L. Marks is one of 19,824 white collar attorneys indexed nationally. Browse white collar attorneys in Illinois →
Jurisdictional Context
Why Local Counsel Matters in Chicago
Practicing law in Illinois. Legal matters in Illinois are governed by state-specific rules of civil and criminal procedure, statutes of limitations, and substantive law. Cases originating in Chicago are typically filed in the local municipal court or the appropriate Illinois state district court, depending on subject matter and amount in controversy. An attorney licensed in Illinois brings working knowledge of local procedural deadlines, judicial practices in this venue, and the substantive law that applies to cases brought here. Out-of-state attorneys generally cannot represent clients in Illinois courts without local counsel or pro hac vice admission.
Chicago Courts and Legal Process
Choosing a Chicago-based attorney means your counsel already knows the local docketing timelines, preferred filing formats, and how individual judges typically rule on procedural motions — details that only come from practicing in this jurisdiction day after day. That local familiarity can translate to better strategy, faster filings, and fewer costly surprises.
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Professional Profile
Why Clients in Chicago Choose Jonathan L. Marks
Selecting an attorney is one of the most consequential decisions you can make when a legal matter arises. Below are the core qualities that distinguish Jonathan L. Marks's practice in the field of criminal defense and white collar.
Broad Practice Area Coverage
Covering criminal defense and white collar, Jonathan L. Marks can address the full spectrum of a client's legal needs without requiring referrals to separate specialists for each issue.
Local Presence in Chicago
A Chicago-based practice means Jonathan L. Marks attends hearings in the same courthouses, knows the local clerks, and understands the unwritten scheduling norms that affect every case filed here.
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Jonathan L. Marks's Practice Areas & Specializations
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