Diane represents clients in antitrust consultation and litigation, including private class actions, government actions, and antitrust compliance programs. Her representations have generated numerous published opinions on a variety of antitrust issues, including relevant market definition and antitrust injury. Diane has been named an "Illinois Super Lawyer in Antitrust Litigation" every year since 2006 and is listed in The Best Lawyers in America; in Antitrust Law.

In addition, Diane is a leading attorney in the area of escheat laws. She represents clients in state audits of unclaimed property and in negotiations and/or litigation arising from state unclaimed property audits. Diane successfully represented McKesson Corporation in a lawsuit against the State of Delaware challenging the legality of requiring the escheat of a particular property type. She currently represents numerous Fortune 500 companies in unclaimed property audits. As a former practicing CPA, Diane combines her experience and understanding of accounting, business transactions, and litigation in unclaimed property audits to assist companies in identifying the relevant facts needed to develop strong factual and legal defenses.

Finally, Diane has extensive experience representing clients, in litigation, arbitrations, and consultation matters, in the area of franchise and distribution law (general and industry-specific). She is on the Governing Committee of the ABA Forum on Franchising, has written numerous articles and made presentations on franchise and distribution law, and she is a former Associate Editor and Articles Editor of The Franchise Law Journal. Diane is listed in Chambers USA, The Best Lawyers in America; and Who's Who Legal in Franchise Law and has been honored as a "Legal Eagle" in franchise and distribution law in the Franchise Times.