Thomas Hamilton brings insurance issue solutions to his clients through 40 years of nationwide coverage litigation, hands on service as Corporate Counsel for liability insurance companies, and career involvement as a legal author and educator.

Mr. Hamilton’s trial and appellate litigation experience includes:

  • Professional claims - made and errors omissions coverages
  • Policyholder class actions arising from premium charges and claim practices
  • Insurer exposure in excess of policyholder limits
  • Loss allocation and proration between insurers
  • Excess-primary insurer relationships
  • Arbitration and mediation of construction defect and coverage controversies

As Corporate Counsel for Liability Insurance Underwriters, Mr. Hamilton's involvement included:

  • Corporate Departmental Reorganization
  • Regulatory Compliance
  • Management of Corporate and Mass Tort Litigation
  • Development of Legal Desk Reference

Mr. Hamilton published and taught in several professional capacities including:

  • Chair of Illinois Institute of Continuing Legal Education
  • General Editor "Commercial & Professional Liability Insurance"
  • Indiana University Researcher & Lecturer

Professional Background

On January 1, 2012, Mr. Hamilton assumed the role Of Counsel and joined professional liability companies OMS National Insurance Company, RRG and Fortress Insurance Company as Corporate Counsel where he served until January 2014.

Mr. Hamilton is a past co-leader of Hinshaw's national Insurance Services Practice Group and served on the firm’s Executive Committee for 23 years. He joined Hinshaw, Culbertson, Moelmann, Hoban & Fuller (now Hinshaw & Culbertson LLP) in June 1970 upon leaving a teaching position at Indiana University.

In the Fall of 2005, Mr. Hamilton completed intensive training in mediation from the faculty of Pepperdine University School of Law’s top-ranked Straus Institute for Dispute Resolution, and is a Certified Mediator in the Cook County Court-Annexed Major Case Civil Mediation Program.

Professional Affiliations

  • American Bar Association (1970-Present)
  • Illinois Bar Association (1970-Present)
  • Indiana Bar Association (1969-Present)
  • Faculty of the Insurance School of Chicago (1988)
  • Illinois Institute of Continuing Legal Education, Past Chair of the Board of Directors (2006)
  • Casualty Insurance Section of the International Association of Defense Counsel, Past Chair (1992)
  • Illinois Association of Defense Trial Counsel, Past Director (1996)
  • Defense Research Institute, Commercial Insurance Coverage and Bad Faith in Excess of Limits, Lecturer

Honors & Awards

  • Recognized by his peers as a Leading Lawyer in the category of Insurance / Insurance Coverage / Reinsurance Law
  • Holds the AV® Peer Review Rating from Martindale-Hubbell, its highest rating for ethics and legal ability
  • Recognized as a "Super Lawyer" by Illinois Super Lawyers magazine (2005)


Mr. Hamilton has lectured on numerous topics related to insurance. His presentations include:

  • "Medicare Subrogation Rights 2015 and Beyond," 2014 Defense Counsel Seminar, OMS National Insurance Company, July 2014.
  • "Introduction and Rationale of Reverse Engagement Letters," 2014 Defense Counsel Seminar, OMS National Insurance Company, July 2014.
  • "New Issues in Claim Handling," 2012 Defense Counsel Seminar, OMS National Insurance Company, July 2012.
  • "Storm Spotter: Early Identification and Resolution of the Complex Claim,” Hinshaw’s 2011 Insurance Services Symposium, Chicago, Illinois, October 2011.
  • “Exposures Arising From Adjustment and Resolution of Medical Malpractice Claims,” Milliman Medical Professional Conference, Las Vegas, Nevada, June 2011.
  • “From the Outside Looking In: Effective Management of Underlying Litigation Where Coverage is Disputed,” Hinshaw’s Annual Insurance Services Symposium, Chicago, Illinois, October 2010.
  • “The Role of Defense Counsel and The Good Faith Claim File,” OMSNIC and Fortress Insurance Group Defense Counsel Seminar, Chicago, Illinois, July 2010.
  • “The ‘No Prejudice’ Standard Fades into the Sunset: Prodigy Communications Corp. v. Agricultural Excess & Surplus Insurance Company and New York Marine & General Ins. Co. v. Lafarge North America,” Hinshaw’s 2009 Insurance Services Symposium, Chicago, Illinois, October 2009.
  • “Legal E&O Coverage and the Potential Exposure from the Subprime Market Meltdown,” Chicago Bar Association, Insurance Law Committee meeting, Chicago, Illinois, March 2008.
  • “Underwriting the Risk of Catastrophic Loss,” Hinshaw’s 2007 Insurance Services Symposium, Chicago, Illinois, May 2007.
  • “Insurance Law—the Recent, Significant Decisions,” Hinshaw’s annual Legal Malpractice & Risk Management conference, Chicago, Illinois, March 2007.
  • “The Very Latest in Construction Claims,” Defense Research Institute’s “Insurance Coverage and Claims Institute,” Chicago, Illinois, May 2006.
  • “Coverage Counsel’s Report—Claim Handling Liability,” Hinshaw Breakfast Briefing, Schaumburg, Illinois, March 2006.
  • “Welcoming Remarks,” Hinshaw’s “2006 Insurance Services Symposium: Creative Management of Claims and Coverage Disputes in a High-Risk Environment,” in Chicago, Illinois, February 2006.
  • "Expected or Intended Conduct: Is it an Occurrence?," Defense Research Institute, Chicago, Illinois, April 2004.
  • "Refusal to Defend—Refusal to Settle—Issues and Consequences," Defense Research Institute, Chicago, Illinois, March 2001.
  • “The Duty to Defend and Reservation of Rights Letters,” Property Loss Research Bureau, The 1999 Claims Conference, New Orleans, Louisiana, March 1999.
  • “Conflict of Interest: Definitions and Illinois Law,” Illinois Association of Defense Trial Counsel, January 1997.
  • “Declaratory Judgment Actions,” Illinois State Medical Inter-Insurance Exchange, January 1995.
  • “The CGL Policy—An Analysis and Comparison of New Claims Made and Old Occurrence Policies,” American Bar Association National Institute, Las Vegas, Nevada, March 1987.


  • "OMS National Legal Desk Reference", OMS National Insurance Company, November 2013.
  • General editor of the treatise, Commercial and Professional Liability Insurance, published by the Illinois Institute for Continuing Legal Education (IICLE) in 2002, supplement 2005, reprinting in 2008, and supplement 2010 and co-author of one of its chapters, “Extra-Contractual Damages.”

Hinshaw Publications


Tom Hamilton lives in Wilmette, Illinois, with his wife, Judy, who retired from Aetna Property & Casualty Company as an SIU Regional Director. His son, Ted, works in Gurnee as a Special Education Teacher where he and his wife, Melissa, raise four grandchildren.


J.D., Indiana University School of Law, 1969

B.A., Economics honors, Indiana University, 1966