Dennis C. Waldon

Senior Litigator

Dennis C. Waldon has a wide variety of experience in complex commercial litigation in the courts and in the context of alternative dispute resolution. Mr. Waldon received his undergraduate degree from the University of Chicago and his law degree from Harvard Law School.
Mr. Waldon has handled significant cases at the trial and appellate levels in the areas of contracts and promissory estoppel, securities and commodities law, antitrust, financial fraud and business torts, RICO, directors and officers insurance, UCC creditor’s rights, letter of credit law, tortious interference, real estate and construction litigation, zoning, professional liability and intellectual property. He has litigated declaratory judgment actions in the insurance area, as well as injunctive relief cases covering a broad range of issues such as trade secrets and non-competition agreements. His experience also includes the representation of clients in class action litigation, administrative proceedings, arbitrations and mediations.

Mr. Waldon has handled environmental litigation and administrative proceedings, as well as related insurance issues. He has conducted jury trials, bench trials and other contested hearings, and has also litigated numerous emergency temporary restraining order and preliminary injunction matters, along with resulting expedited appeals. His experience also extends to intra-corporate disputes, shareholder agreements, alleged breaches of fiduciary duty and issues of unfair competition.
Mr. Waldon is admitted to practice in several United State District Courts, the Court of Appeals for the Seventh Circuit and the United States Supreme Court. He is a member of The Lawyers Club of Chicago and various alumni groups of the University of Chicago, and a former member of The American Academy of Hospital Attorneys. He also has served as an arbitrator for the Circuit Court of Cook County, the National Futures Association and the Chicago Mercantile Exchange. He has received the Award for Excellence in Pro Bono Service from the United States District Court and the Federal Bar Association. He also serves on the Judicial Evaluation Committee of the Chicago Bar Association.

A detailed listing and description of Mr. Waldon’s experience is available. The commercial litigation cases he has handled include intellectual property disputes in the areas of patent and copyright law and trade secrets. In one such case, he represented the holder of patents for numerous medical devices designed to improve surgical procedures in a lawsuit against the corporate assignee of the patents, which breached contractual royalty arrangements and misappropriated the relevant intellectual property. The lawsuit brought claims for rescission, an accounting, constructive trust, injunction and breach of contract. Another case involved claims of patent infringement and false advertising under the Lanham Act and the Illinois Consumer Fraud and Deceptive Business Practices Act.

Other recent cases handled by Mr. Waldon include litigation surrounding the liquidation of a failed insurance company and allegations of breach of fiduciary duties on behalf of management; emergency injunction proceedings to compel municipal officials to comply with a City of Chicago ordinance concerning the transfer of real property to the client; a suit by one former medical practitioner partner against the other former partners and co-guarantors of bank financing; a declaratory judgment action on behalf of homeowners against an unlawfully organized homeowners’ association; and the claim of a retired corporate director for improperly denied retirement benefits.

Mr. Waldon has handled cases resulting in more than seventy reported decisions.


B.A., University of Chicago
J.D., Harvard University

Professional Licenses

United States Supreme Court
United States District Court for the State of Illinois
United States District Court of Appeals for the Seventh Circuit

Professional Associations

Lawyers Club of Chicago
Federal Bar Association
Decalogue Society


AV Preeminent® Rating from the Martindale-Hubbell® Peer Review Ratings™ program
Recognized as one of the Top Lawyers of Chicago by The National Law Journal.

Contact Info
Weissberg and Associates, Ltd.
401 South Lasalle, Suite 403
Chicago, Illinois 60605