Atty. Sean M. Koller
Sean Koller represents clients in a variety of industries in complex business disputes. Whether handling a pre-litigation negotiation, representing a client in a mediation, federal or state court litigation, arbitration, a government investigation or inquiry, or working out a settlement, Sean brings the experience needed to resolve matters efficiently and effectively.
Profile Summary
About Sean M. Koller at a glance
Sean M. Koller is a criminal defense and white collar attorney based in Chicago, Illinois, practicing at Sperling Kenny Nachwalter PA. Admitted to practice in Illinois, Illinois State Bar Association. Educated at University of Chicago (J.D., 2016). Recognitions include Best Lawyers in America — Criminal Defense: White-Collar (2026), Best Lawyers in America — Awards: (2026), and Best Lawyers in America — - “Ones to Watch” – Criminal Defense/White Collar, 2024-2025 (2026). Serands clients in Chicago, IL and the surrounding metropolitan area.
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About
- Sean Koller represents clients in a variety of industries in complex business disputes
- Whether handling a pre-litigation negotiation, representing a client in a mediation, federal or state court litigation, arbitration, a government investigation or inquiry, or working out a settlement, Sean brings the experience needed to resolve matters efficiently and effectively
- Sean has handled complex commercial suits, antitrust and healthcare disputes, derivative suits, tort disputes, and contractual claims, among other matters
- He has represented clients in cases before the American Arbitration Association (AAA), JAMS, the American Health Law Association, and other alternative dispute resolution tribunals
- Additionally, Sean has successfully defended individuals and corporations against government investigations conducted by the Department of Justice, Securities and Exchange Commission, Public Company Accounting Oversight Board, State Attorneys General, and other state and federal government agencies
- Both public corporations and nonprofit organizations also turn to Sean to help guide them through internal investigations to identify and resolve problems
- Sean listens closely to his clients, making certain that he understands their business and industry, and the specific problems they face
- Armed with that knowledge, he crafts solutions that work best for them
- In litigation, Sean applies his knowledge of the courts and their procedures and considers the opposing counsels’ arguments and strategy
- Then he devises a plan of action to position his clients for success
- Regarded as diligent, intelligent, and analytical, he stays ahead of the curve, keeping current on new laws and regulations, especially in Illinois, and how they may impact his clients
- In addition to his active practice, Sean engages in pro bono efforts
- these include representing nonprofit organizations in internal investigations, prisoners in post-conviction hearings and suits, and individuals in Public Trust Doctrine suits
- Before joining the firm, Sean was an associate at McDermott Will & Emery LLP, an Am Law 25 law firm
- He brings that “big law” experience to bear when representing Sperling Kenny Nachwalter clients
Practice Areas Explained
Sean M. Koller's Areas of Practice
Each practice area below reflects the types of cases Sean M. Koller handles, with a brief overview of what that area of law covers.
A criminal defense attorney protects your rights from arrest through trial. Find experienced lawyers handling DUI, drug, federal, theft, and violent-crime charges.
Sean M. Koller is one of 214,270 criminal defense attorneys indexed nationally. Browse criminal defense attorneys in Illinois →
Sean M. Koller is one of 20,025 white collar attorneys indexed nationally. Browse white collar attorneys in Illinois →
Jurisdictional Context
Why local counsel matters in Illinois
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 andnue, 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.
Looking for additional Illinois attorneys? Browse all attorneys in Chicago or all attorneys in Illinois.
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