(312) 759-7223
Diane F. Klotnia

Ms. Klotnia has litigated many complex commercial and legal malpractice cases and is well known for her command of legal ethics. She has represented clients in cases involving legal malpractice defense, attorney disciplinary matters, corporate and partnership disputes, derivative actions and shareholder disputes, RICO litigation, contract disputes, commercial mortgage foreclosure, environmental law, constitutional law and federal civil rights. Ms. Klotnia has been selected to the Illinois Super Lawyers list in 2005, 2006 and every year since 2008.
       Ms. Klotnia has been involved in cases in the U. S. District Courts in Illinois, Hawaii, Kansas and Pennsylvania and in the state courts of Illinois, Indiana, Wisconsin, and Delaware and has participated in appeals to the U. S. Supreme Court, the U. S. Court of Appeals for the Seventh Circuit and for the Third Circuit, and to the Illinois Appellate Court and the Wisconsin Appellate Court.

Selected Engagements

Represented several large law firms in separate, unrelated lawsuits involving claims of legal malpractice. The underlying matters that gave rise to the claims involved complex commercial transactions, patent litigation, and commercial litigation.

Appointed Special Master by U. S. District Court to review and provide recommendations on privilege and work product claims in connection with an SEC lawsuit.

Represented hospital system in federal class action by registered nurses alleging antitrust violations, and led defense group of six law firms in successful presentation of complex econometric issues to the Court.

Represented a manufacturer of railroad tracks and wheels in connection with its claims under an environmental indemnity arising out of the manufacturer’s purchase of several facilities.

Represented clothing manufacturer against anti-trust claims asserted by a retailer.

Represented a trustee and corporate officer in several related lawsuits involving shareholder derivative claims and claims of breaches of fiduciary duty.

Represented two closely-held corporations in connection with claims by one of the shareholders that he had been frozen out by the other shareholder.

Represented the seller of manufacturing facilities in arbitration held in connection with post-closing disputes, including claims arising out of an environmental indemnity.

Represented an international power manufacturing corporation in connection with disputes between the corporation and its joint venture partners arising out of their development and operation of a power co-generation facility in Hawaii.

Represented a minor in child abuse and neglect proceedings in Cook County. The Illinois appellate court resolved in favor of the minor the novel issue of whether a minor is entitled to counsel of her own choice in such proceedings, in lieu of the public guardian.

Represented, along with the Roger Baldwin Foundation, a physician who wished to exercise his first amendment rights and demonstrate at the Democratic National Convention in Chicago in an area other than the area designated by the City and the DNCC. Following an evidentiary hearing, the trial court ruled in favor of the client and other demonstrators.


B.S., University of Illinois, Business Administration, 1984
Graduated with highest honors

J.D., University of Chicago Law School, 1987
Graduated with highest honors
Order of the Coif
Managing and Book Review editor of the University of Chicago Law Review


Admitted to the Pennsylvania Bar, 1988 (currently inactive); Illinois Bar, 1989

Associate with Shea & Gardner in Washington, D.C., 1987-1988

Law clerk to the Hon. Max Rosenn, U.S. Court of Appeals for the Third Circuit, 1988-1989

Associate with this firm, 1989-1994; became a partner in 1995

Member, ISBA Standing Committee on Professional Conduct, 2012 to present
    Chair, June 2017-June 2018
    Vice Chair, June 2016-June 2017
    Secretary, June 2015-June 2016

Vice-Chair, ISBA Special Committee on Nonlawyer Legal Service Providers, 2019-present

Member, ISBA Special Committee on Judicial Disqualification Standards, 2012

Chair, Professional Responsibility Committee, Chicago Bar Association, 2009-2010

Vice-Chair, Professional Responsibility Committee, Chicago Bar Association, 2008-2009

Co-Chair, Joint Task Force of the CBA, ISBA and IJA on Limited Scope Of Representation, 2010-2011

Adjunct faculty of Trial Advocacy at Northwestern University School of Law, 2009-2011

Adjunct faculty of Professional Responsibility at Northwestern University School of Law, 2011 to present


American Bar Association

Illinois State Bar Association

Chicago Bar Association

Chicago Council of Lawyers

Board member, ACLU of Illinois, 1999 to present; Executive Committee Member, ACLU of Illinois, 2001 to present. As a board member, developed a weekly call-in program on cable television called “You Have the Right.”

Board member, University of Illinois College of Business Alumni Association, 2002-2012

Board member and officer, Healthcare Foundation of Northern Lake County, 2006 to 2016

Alternate Board member, Chicago Lawyers’ Committee for Civil Rights Under Law, 2006-2012

Selected Publications and Presentations

“Ethical Issues: Lawyer Relocation,” presented with Michael L. Shakman at Professional Responsibility Committee, Chicago Bar Association, 2019.

“Legal Ethics and Social Media,” presented with Mary Foster at Illinois Professional Responsibility MCLE Marathon 2016, Practicing Law Institute, 2016.

“Why Do Environmental Lawyers Get Sued For Malpractice? What Can They Do To Avoid A Malpractice Claim?” Bloomberg BNA, 2013. Written with Michael L. Shakman and Edward W. Feldman.

“A Primer On Legal Malpractice And Professional Responsibility: Managing Risk in the Patent Arena,” presented at Midwest Intellectual Property Summit for the Indiana Continuing Legal Education Forum, November 15, 2013.

“A Primer on Legal Malpractice for Patent Lawyers,” Bloomberg BNA – Patent, Trademark & Copyright Journal, November 2012. Written with Michael L. Shakman and Edward W. Feldman.

“Conflict of Interest Considerations When a Lawyer Changes Law Firms,” presented at Webinar for the Illinois Attorney Registration & Disciplinary Commission, 2011.

“Contacting and communicating with putative class members in the pre-certification phase of class actions lawsuits – ethical considerations under the Rules of Professional Conduct and a recent ABA formal ethics opinion,” presented at Professional Responsibility Committee, Chicago Bar Association, 2007.

“Mediation of Business Disputes,” Alternative Dispute Resolution, Illinois Institute for CLE, 2001. Written with Michael L. Shakman and Edward W. Feldman.

“Trust Us: How Rules on Referral Fees Influence the MDP Debate,” Chicago Bar Association Record, September 2000. Written with Michael L. Shakman.