Jason Osteen, Robert Kingsland, Leland Dempsey, Sydney Dowell, and Diane Plantz, JD, MD

About Dempsey Kingsland Osteen

Kansas City Medical Malpractice & Personal Injury Attorneys

The legal team at Dempsey Kingsland Osteen works to ensure that the injured and their family are fully compensated for their injuries from medical malpractice or other negligence. Our goal is to secure full and complete damages that anticipate the long-term needs of our clients.

Our experience and resources enable us to obtain command of the facts and medicine to achieve optimal results. Helping those harmed by the negligent acts of others is the sole focus of our law practice here at Dempsey Kingsland Osteen.

An Accomplished Legal Team Advocating for You

Trial lawyers Leland Dempsey, Robert Kingsland, and Jason Osteen have more than 100 years of experience and a record of significant verdicts and settlements in a wide spectrum of cases, including medical malpractice, vaccine injuries, nursing home negligence, and car, truck and motorcycle collisions. We have successfully obtained multimillion-dollar recoveries in medical malpractice cases, catastrophic injury cases, and wrongful death cases.

Jane O’Shaughnessy, MD and Cathy Brown, RN

A Talented & Experienced Medical Team Advocating for You

From years of hands-on experience in personal injury and medical malpractice litigation, our lawyers have a high level of expertise in medical malpractice and catastrophic injury claims and litigation. Dempsey Kingsland Osteen has an exclusive relationship with two medical professionals who are intimately involved in the evaluation of our cases.

  • Jane O’Shaughnessy, M.D., is a board-certified physician who has served as a physician consultant to our firm since 1999. Her credentials include 17 years as the former chair of emergency medicine at a major New York hospital. She obtained board certification in Emergency Medicine and supervised twenty physicians within her Department of Emergency Medicine.
  • Cathy L. Brown, RN, BSN, has conducted medical research for Dempsey Kingsland Osteen as our nurse consultant since 2003. Her distinguished career in nursing spans more than 35 years in pediatrics, neonatology, cardiology, and surgery, including working with heart transplant surgery pioneer Michael DeBakey.

In addition, our firm has also cultivated a nationwide network of top professionals in many fields, including accident reconstructionist, medical specialists, life care planners, and economists. Working with experts in these various fields helps us maximize the compensation we obtain for our clients.

Our Medical Professionals Work Exclusively for Dempsey Kingsland Osteen

Dempsey Kingsland Osteen

Leland F. Dempsey

Founding Member & Partner

Attorney Leland F. Dempsey is a founding member of Dempsey Kingsland Osteen. He focuses his practice on medical malpractice and personal injury cases.

Learn more about Leland

Robert D. Kingsland, JR.

Founding Member & Partner

A graduate of the law school at Georgetown University, Robert has been admitted as a member of the American Board of Trial Advocates (membership is limited to the top 5% of trial attorneys) and Superlawyers of Missouri and Kansas. 

Learn more about Robert

Jason Osteen


Attorney Jason P. Osteen focuses his practice on medical malpractice and personal injury cases.

Learn more about Jason

A Personal Touch

Dempsey Kingsland Osteen has a large dedicated staff and we pride ourselves on our personal service, and accessibility to our clients. Our offices are conveniently located in Kansas City, with ample parking. We offer free consultation, including evening and weekend appointments. We will visit seriously injured clients or their family advocates at their homes or hospital rooms.

Let us be your voice.
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What Our Clients Are Saying

Bob Kingsland worked very hard on my case as well as the rest of the staff. Very honest and straightforward, and did not settle until they agreed on something my case deserved. Worth all the time and patience.

Kristi K.

I highly recommend Bob & Lee for the knowledge and sound advice they always give from start to finish.

Erika K.

We did not think we would ever need a lawyer. Leland F. Dempsey and his team helped us every step of the way. I am really satisfied with the results.

Mike. K

I have worked with Bob and Lee on multiple cases. One was a slip and fall case that went to a verdict in excess of $345,000. The other three cases were settlements in the six-figure range. Bob and Lee are both efficient and competent attorneys.

James D.

Verdicts & Settlements

Your Victories Are Our Victories

$43.1M Vaccine Leads to Paralysis/Quadriplegia
$15.5M Medical Malpractice
$7.32M Vaccine Leads to Cardiac/Respiratory Arrest & Brain Damage
$7.25M Workers' Compensation
$7M Breach of Policy Coverage/Bad Faith Claim
$5M Truck-Car Fatality Collision
$4M Head-On Collision
$2.69M Elective Surgery Fraud/Malpractice
$2.3M Bariatric Surgeries
$2M Rear End Truck Collision
$1.94M Medical Malpractice
$1.9M Medical Malpractice
$1.85M Worker Crushed by Forklift
$1.83M Catastrophic Injury
$1.75M Fall at Hospital
$1.75M Failure to Diagnose
$1.5M Medication Error
$1.2M Vehicular Collision
$1.1M Rear End Truck Collision
$1M Tractor-Trailer Driver Dies
$1M Settlement Motorcyclist
$1M Settlement Failure to Diagnose Bowel Perforation
$1M Failure To Diagnose Spinal Epidural Abscess
$1M Failure to Diagnose Cancer Results in Death