Attorneys of Onder Law - St. Louis Personal Injury Attorneys
Kari S. Peterson - St. Louis Personal Injury Lawyer

Kari S. Peterson

Auto & Trucking Accidents, Workers' Compensation, Slip & Fall, Dog Bite, Premises Liability


Kari attended law school at the University of Missouri - Kansas City and graduated in 2000. While in school she was an Editor for The Urban Lawyer Law Journal, authored an article for publication, received an American Jurisprudence Award, was recognized for her student leadership and made Dean's List. After graduating Kari practiced law with a multi-state defense firm in both its Kansas City and St. Louis offices. This experience gave her firsthand knowledge of the strategies that insurance companies, and their lawyers, utilize to defend and deny claims of those that are injured.  Kari soon realized her true calling lay in representing people hurt by the negligence and wrongful actions of others. She is able to use the knowledge she gained as a defense lawyer to help her clients with their cases.

Kari is a founding partner of Onder, Shelton, O'Leary & Peterson, LLC. Kari's practice includes all aspects of personal injury litigation, including: catastrophic injuries, many of which result in amputations; wrongful death claims; products claims; premises liability cases; auto and trucking accidents; all-terrain and side by side/utility-task vehicle accidents; forklift accidents; electrocution and power line cases; construction and workplace accidents; and workers' compensation. Kari also engages in a national practice of representing people injured as a result of pharmaceutical and drug products in mass tort litigation.

Kari has successfully won verdicts, awards and settlements in multiple civil jurisdictions, as well as the Missouri Division of Workers' Compensation and the Illinois Workers' Compensation Commission. In her practice Kari has obtained millions of dollars for clients injured by the negligence of others throughout the states of Missouri and Illinois.

Kari has successfully handled wrongful death cases across the state of Missouri. In March of 2016, after years of litigation in Stoddard County, Missouri, she obtained $1,200,000.00 for the family of a man killed in a side by side/UTV rollover accident. In another case Kari represented the family of a man killed in a trucking accident due to tire failure. She also represented the family of a pedestrian who was killed by a negligent driver on a roadway.

Kari often handles cases for individuals injured as a result of drunk drivers, and is experienced with the special challenges involved in these types of claims. Kari was successful in obtaining $1,177,000.00 for a family that sustained various injuries in a one car accident that occurred when the driver lost control and the vehicle overturned.

In 2015 Kari was named a Missouri Super Lawyer which represents the top 5% of practicing lawyers in the state. In 2014 Super Lawyers named Kari a Rising Star, a distinction granted to less than 2.5% of the attorneys in the state. Kari is also listed in KC Magazine as a Top Attorney in Plaintiff's Personal Injury General Law. The Super Lawyers selection process has a patent (U.S. Pat. No. 8,412,564) from the United States Patent and Trademark Office. This distinction is relevant to both attorneys and consumers, as it demonstrates Super Lawyers credibility as an impartial third-party rating system.

Kari's dedicated service to her clients has been further recognized by Martindale-Hubbell, who granted her their Client Distinction Award, an achievement that less than 1% of the more than 900,000 lawyers in the U.S. can claim. Kari has also been selected as one of the Top 100 Trial Lawyers in Missouri by The National Trial Lawyers, a professional organization composed of the premier trial lawyers from across the country who exemplify superior qualifications of leadership, reputation, influence, stature and profile. In addition, she was named one of the Top 40 Under 40 Litigation Lawyers in the State of Missouri by the American Society of Legal Advocates, an invitation only organization whose members must not only have stellar legal credentials, but also have proven commitment to community engagement, leadership, and the highest professional standards.

In 2004 Kari was appointed to the Missouri Bar's Workers' Compensation Committee which consists of Judges and attorneys across the state. The Committee's purpose is to study the law and develop legislative proposals, as well as publish educational materials and present programs about current trends in the law. Kari has given lectures on the effects of legislative changes in the Missouri Workers Compensation system at Continuing Legal Education seminars.

Kari also serves on the Board of Kids' Chance, Inc. of Missouri. Kids' Chance is a not-for-profit organization which provides post high school scholarships to children of Missouri workers killed or disabled on the job. In addition to being on the Board, Kari is a long-standing member of the Scholarship Committee, where she reviews scholarship applications for approval.

Kari was raised in St. Louis with numerous physicians in her family. Both her father and grandfather had medical practices in the St. Louis area, and her father was the Chief of Family Practice for a hospital system in St. Louis. Kari's brother is also a physician. This gives Kari a unique resource in her representation of seriously injured clients.

Kari is licensed to practice in Missouri, Illinois and Kansas and is admitted to the Eastern and Western District of the Missouri Federal Courts. She is a member of the American Bar Association, the Bar Association of Metropolitan St. Louis and the Missouri Association of Trial Attorneys.


Kari lives in St. Louis with her husband, who is also an attorney, their son and golden doodle.

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.