Donal Maurice O'Brien
as of 6/18/2026 7:43:15 AM
Donal Maurice O'Brien
Arnold & Porter
70 West Madison Street Suite 4200
Chicago, Illinois 60602
(312) 583-2300
Donal.OBrien@arnoldporter.com
Date Admitted
November 05, 1998
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.