as of 6/20/2026 3:13:43 AM

John Lansing Isaac

5545 S Lee St
Littleton, Colorado 80127-1821

(303) 979-5616

Not available

Date Admitted

November 27, 1973

Illinois Registration Status

Not authorized to practice law due to discipline and has not demonstrated required MCLE compliance – Last Registered Year: 1995

Malpractice Insurance

No malpractice report as attorney is disciplined

Public Record of Discipline and Pending Proceedings
Case(s) below are identified by caption and Commission case number. If there is more than one case, the cases are listed from most recent to oldest. A case may have more than one disposition or more than one component to a disposition, in which case each disposition and component is also listed separately within that case record, again in an order from most recent to oldest.

Click on
Case Research
to access any documents regarding this lawyer that are in our database. Case Research contains most disciplinary opinions of the Supreme Court and most disciplinary orders and board reports issued since 1990. If Case Research does not contain the information you are seeking, please contact the Commission's Clerk's Office for assistance. Contact information for the Clerk's office is available under Clerk's Office Services.

In re Isaac, John Lansing, 2010PR00148
Disposition Disbarment On Consent
Effective Date of Disposition 11/12/2010
End Date of Disposition No disposition end date scheduled at this time. Discipline continues until further order of the Court.
Definition of Disposition Disbarment on consent is imposed by the Supreme Court based upon the lawyer's filing of a motion to strike his or her name from the roll of attorneys in face of disciplinary charges that are set forth in the Administrator's Statement of Charges. The disbarred lawyer is not authorized to practice law during the period of the disbarment on consent and may not return to the practice of law unless and until the lawyer has demonstrated his or her rehabilitation, good character, and current knowledge of the law in a subsequent reinstatement case, which may not be filed until three years after the effective date of the disbarment on consent.
Case Summary Mr. Isaac, who was licensed in 1973, was disbarred on consent. He neglected several patent applications, made misrepresentations to clients and to the United States Patent and Trademark Office, and engaged in the unauthorized practice of law.
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.