Guy A. Thiessen

Attorney Profile

Top Rated Health Care Attorney in Tulsa, OK

GT Law Firm, P.C.
 | 15 W 6th Street, Suite 2112
Tulsa, OK 74119
Phone: 866-547-9842
Fax: 918-471-2178
Selected To Super Lawyers: 2010 - 2019
Licensed Since: 1989
Practice Areas:
  • Health Care
Attorney Profile

Focusing his efforts on nursing home negligence cases, Guy Thiessen is an attorney with the GT Law Firm and represents clients in Oklahoma who have been victims of nursing home abuse and neglect, and in other healthcare settings. With a desire to help the powerless, he became an attorney and has represented the injured and their families since 1990. Guy has handled injury and wrongful death cases in types of health care settings, such as nursing homes, assisted living, hospitals, residential care facilities, home health care, and homes for the developmentally disabled.

With a Juris Doctor from the Oklahoma City University School of Law, he is admitted to practice in the state of Oklahoma as well as before the United States Court of Appeals for the 10th Circuit and all federal courts in Oklahoma. He is also admitted to appear before the United States Supreme Court. Guy is a longtime member of the American Association for Justice and the Nursing Homes Litigation Group within the organization.

In 2006, Guy was appointed to the Oklahoma Legislative Task Force on Nursing Home Insurance and was an integral part of requiring all nursing homes to obtain liability insurance. As former president of the Oklahoma Association for Justice, he is a current member of the organization and has spoken and lectured to other lawyers at seminars on how to handle cases against assisted living facilities and nursing homes.

In Tulsa County, he is listed as an attorney with the Lawyers for Children program, which allows him to represent abused or neglected children in court proceedings. For over 25 years, Guy has worked in both large and small firms to hone his skills to provide the best representation to the injured and their loved ones.

Practice Areas
  • 100%Health Care
Focus Areas

Nursing Home


Selected to Super Lawyers for 10 yearsbottom-image

Super Lawyers: 2010 - 2019

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About Guy Thiessen

Admitted: 1989, Oklahoma

Professional Webpage:

Bar/Professional Activity:

  • United States Supreme Court
  • Oklahoma Legislative Task Force on Nursing Home Insurance, 2006
  • AAJ Nursing Home Litigation Group
  • American Association of Justice (AAJ), Member
  • 10th Circuit Court of Appeals
  • 8th Circuit Court of Appeals
  • Arkansas Federal Courts
  • Arkansas
  • Oklahoma Federal Courts
  • Oklahoma
  • Guy has been a member of Oklahoma's trial lawyer organization Oklahoma Associate for Justice since 1989 and been actively involved in the leadership since 1996.  He served on the Board of Directors from 1996 to present and have held the following positions: Vice President: 2005-2006; President-Elect: 2006-2007; President: 2007-2008; Immediate Past-President: 2008-2009, 2008

Pro bono/Community Service:

  • Guy is listed attorney in the Lawyers for Children program in Tulsa County representing neglected or abused child in court proceedings. 

Scholarly Lectures/Writings:

  • Guy has presented several lectures in Oklahoma at Continuing Legal Education seminars on the topic of nursing home and assisted living litigation.


  • Guy has recovered millions of dollars for clients over the span of his career and continues to fight for his client's rights to be compensated for their injuries or for the death of a family member.


Industry Groups

  • Nursing Home; Assisted Living; Hospital; Medical Malpractice
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Office Location for Guy A. Thiessen

15 W 6th Street
Suite 2112
Tulsa, OK 74119

Phone: 866-547-9842

Fax: 918-471-2178

Guy A. Thiessen:

Last Updated: 7/22/2019

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