Attorneys of Onder Law - St. Louis Personal Injury Attorneys
William L. Barton - St. Louis Lawyer

William L. Barton

Products Liability and Personal Injury

Email Address:barton@onderlaw.com

Bill was born in St. Louis Missouri, and raised in the Metro East, where he and his wife currently reside with their five children. He attended Southern Illinois University at Edwardsville and graduated Cum Laude with a Bachelo's degree in Political Science. He later earned masters’ degrees in Special Education and Counseling Psychology, from McKendree University.

Bill worked as a counselor-intern for St. Elizabeth's Hospital, and a clinician for Chestnut Health Systems, in Belleville, Illinois. He provided mental health and addiction recovery services, clinical analysis, and employee assistance support. His clients included federal and state probation, and inmates in the Federal Bureau of Prisons. Through the Wounded Warrior Project, he served combat veterans affected by PTSD. He is a trial consultant, specializing in juror analysis and selection.

Bill obtained his law degree from Southern Illinois University at Carbondale School of Law, where he served as Magister of the Lesar Inn for Phi Delta Phi, the International Legal Honors Society. He was an intern with the Illinois Innocence Project, assisting senior defense attorneys by interviewing convicted offenders to determine their suitability for the program. He worked as a law clerk in DUI defense, worker’s compensation, insurance defense, and family law firms in Southern Illinois. He served as a State's' Attorney in St. Clair County, Illinois, as a 711 Licensee. Bill was the Editor for the 2017 St. Clair County Juvenile Justice Council Teen Court Manual.

Since joining OnderLaw, LLC, Bill focuses his practice on the areas of personal injury and products liability, including mass tort litigation on a national scale. He is proud to partner with and advocate for his clients, challenging corporate practices that place profits before people. Bill is licensed to practice in the States of Missouri and Illinois and is a member of the Missouri Association of Trial Attorneys.

Free Case Review


Onder Law holds the highest possible peer review rating from Martindale-Hubbell

Onder Law holds the highest possible peer review rating from Martindale-Hubbell

Million Dollar Advocates Forum

We have been recognized by the Million Dollar Advocates Foum for securing million dollar settlements on behalf of our clients. Fewer than 1% of all attorneys receive this recgonition.

Multi-Million Dollar Advocates Forum

We have been recognized by the Million Dollar Advocates Foum for securing multi-million dollar settlements on behalf of our clients. Fewer than 1% of all attorneys receive this recgonition.

Super Lawyers

The attorneys of Onder Law have been recognized as Super Lawyers

Multi-Million Dollar Advocates Forum

We have been nominated as one of the Best Attorneys in America - The Most Qualified Attorneys in Our Country by Rue Ratings

Member National Trial Lawyers Association

The attorneys of Onder Law are proud members of the National Trial Lawyers Association


Onder Law handles mass tort claims that are filed in federal courts nationwide. Attorneys at Onder Law are licensed only in Missouri, Illinois and Kansas; however our attorneys have handled cases nationwide* including in: Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin and Wyoming.

Attorneys at Onder Law have represented clients in federal multi-district litigation in the following cities*: Atlanta, GA, Austin, TX, Baltimore, MD, Birmingham, AL, Boston, MA, Buffalo, NY, Charlotte, NC, Chicago, IL, Cincinnati, OH, Cleveland, OH, Columbus, OH, Dallas, TX, Denver, CO, Detroit, MI, Fresno, CA, Hartford, CT, Honolulu, HI, Houston, TX, Indianapolis, IN, Jacksonville, FL, Kansas City, MO, Las Vegas, NV, Los Angeles, CA, Louisville, KY, Memphis, TN, Miami, FL, Milwaukee, WI, Minneapolis, MN, Nashville, TN, New Orleans, LA, New York, NY, Oklahoma City, OK, Orlando, FL, Philadelphia, PA, Phoenix, AZ, Pittsburgh, PA, Portland, OR, Providence, RI, Raleigh, NC, Richmond, VA, Riverside, CA, Rochester, NY, Sacramento, CA, Salt Lake City, UT, San Antonio, TX, San Diego, CA San Francisco, CA, San Jose, CA, Seattle, WA, St. Louis, MO, Tampa, FL, Tucson, AZ, Tulsa, OK, Virginia Beach, VA and Washington, DC.

* In order to represent clients in states where the attorneys are not licensed, they must be granted admission pro hac vice or associate with local counsel.