Onalee Chappeau is an associate in Armstrong Teasdale’s Litigation practice group, where she represents clients in various civil litigation matters.

She draws on her previous experience as an intern in the U.S. Attorney’s Office for the Eastern District of Missouri to aid in trial preparation, conducting legal research, organizing evidence and drafting various legal documents including pretrial motions and legal memoranda.

Services and Industries


Onalee was a summer associate at Armstrong Teasdale prior to joining the firm full time. While in law school she also gained experience representing indigent clients in a variety of civil matters through SLU Law Legal Clinics. While in law school, Onalee interned at the U.S. Attorney’s Office for the Eastern District of Missouri and served as a judicial extern for Judge Raymond C. Gruender of the Eighth Circuit Court of Appeals.


  • Saint Louis University School of Law  (J.D., summa cum laude, 2020)
    • Order of the Woolsack
    • Dean’s List
    • Honor Council (1L Elected Representative)
    • Street Law
    • Public Interest Law Group
    • Saint Louis University Law Journal (Staff Editor )
  • University of Iowa  (B.A., B.S., with honors and distinction, 2013)
    • International Studies
    • Political Science
    • Critical Language Scholarship Program (Arabic), Tangier, Morocco (Summer 2013)
    • Research Fellow at Iowa Center for Undergraduate Research (2012-2013)
    • Honors Senior Thesis Project: “Unveiling Misconceptions about Women in Jordanian Society: Islamist Opposition Parties, Sharia Law, and Democracy”


  • Missouri
  • Illinois
  • U.S. District Court, Eastern District of Missouri
  • U.S. District Court, Western District of Missouri
  • U.S. District Court, Southern District of Illinois

Professional Activities

  • The Missouri Bar
  • Bar Association of Metropolitan St. Louis (BAMSL)
  • Theodore McMillian Inn of Court (Pupil)

Charitable and Civic Involvement

  • University City Summer Band (2014-present)
  • AmeriCorps VISTA (2014-15)


  • Academic Excellence Awards: Contracts II, Civil Procedure II, Immigration Law, Criminal Procedure - Investigation
  • Alpha Sigma Nu
Contact Us
  • Worldwide
  • Boston, MA
  • Denver, CO
  • Edwardsville, IL
  • Jefferson City, MO
  • Kansas City, MO
  • Las Vegas, NV
  • London, England
  • New York, NY
  • Philadelphia, PA
  • Princeton, NJ
  • Salt Lake City, UT
  • St. Louis, MO
  • Wilmington, DE
abstract image of world map
Boston, MA
800 Boylston St.
30th Floor
Boston, MA 02199
Google Maps
Boston, Massachusetts
Denver, CO
4643 S. Ulster St.
Suite 800
Denver, CO 80237
Google Maps
Denver, Colorado
Edwardsville, IL
115 N. Second St.
Edwardsville, IL 62025
Google Maps
Edwardsville, Illinois
Jefferson City, MO
3405 W. Truman Boulevard
Suite 210
Jefferson City, MO 65109
Google Maps
Jefferson City, Missouri
Kansas City, MO
2345 Grand Blvd.
Suite 1500
Kansas City, MO 64108
Google Maps
Kansas City, Missouri
Las Vegas, NV
3770 Howard Hughes Parkway
Suite 200
Las Vegas, NV 89169
Google Maps
Las Vegas, Nevada
London, England
200 Strand
London, WC2R 1DJ
Google Maps
New York, NY
919 Third Ave., 37th Floor
New York, NY 10022
Google Maps
New York City
Philadelphia, PA
2005 Market Street
29th Floor, One Commerce Square
Philadelphia, PA 19103
Google Maps
Philadelphia, Pennsylvania
Princeton, NJ
100 Overlook Center
Second Floor
Princeton, NJ 08540
Google Maps
Princeton, New Jersey
Salt Lake City, UT
201 South Main Street
Suite 750
Salt Lake City, UT 84111
Google Maps
Salt Lake City, Utah
St. Louis, MO
7700 Forsyth Blvd.
Suite 1800
St. Louis, MO 63105
Google Maps
St. Louis, Missouri
Wilmington, DE
300 Delaware Avenue
Suite 210
Wilmington, DE 19801
Google Maps
Wilmington, Delaware