as of 6/18/2026 6:54:40 AM

John Stuart Duncan III

Herbolsheimer, Duncan & Klinefelter PC PC P.C.
654 First Street Suite 400
Lasalle, Illinois 61301-2484

(815) 223-0111

Not available

Date Admitted

November 06, 1973

Illinois Registration Status

Active and authorized to practice law

Malpractice Insurance

In annual registration, the attorney reported that the attorney, or the attorney’s firm, maintains malpractice insurance.

Public Record of Discipline and Pending Proceedings

None

Check carefully to be sure that you have selected the correct lawyer. At times, lawyers have similar names. Disciplinary results displayed above, if any, include information relating to any and all public discipline, court-ordered disability inactive status, reinstatement and restoration dispositions, and pending public proceedings. Investigations are confidential and information relating to the existence or status of any investigation is not available. For additional information regarding data on this website, please contact ARDC at (312) 565-2600 or, from within Illinois, at (800) 826-8625.

ARDC makes every effort to maintain the currency and accuracy of Lawyer Search. If you find any typographical errors in the Lawyer Search information, please email registration@iardc.org. Attorneys may make changes to their contact information on the ARDC’s Online Registration page, or by completing and submitting the Change of Address form available on our Address Changes page. Name changes require the filing of a motion with the Supreme Court. Please consult our Name Change Requests page for details.