Welcome to Johnson County Clin-Trials

Johnson County Clin-Trials (JCCT) has been providing clinical research services to small biotechs as well as large multi-national CRO’s and Pharma since 2005. JCCT is a full-service, clinical research site with experience in Phases I-IV outpatient/inpatient trials including numerous First-In-Man studies. In the decade prior to 2005, all founders and staff were actively involved in clinical research. This accumulation of experience and knowledge is the foundation of our success which is passed onto our sponsors, assuring successful study conduct.


Casey Johnson D.O.
President / Principal Investigator

Co-founder and president of JCCT, Dr. Johnson has extensive experience in conducting clinical research trials. He’s completed hundreds of trials since 1995 with an emphasis on complex vaccines with novel platforms. Dr. Johnson is board certified in Family Practice, spending 15 years as both an emergency room physician and Director of Emergency Services.

Nathan Arthur, B.S.
Vice President / Laboratory Director

Co-founder and vice president of JCCT, Nathan has been involved in clinical research since 1998, including 7 years as the laboratory manager for two large CRO’s. One area he specializes in is PBMC isolation and harvesting. He received a bachelor’s degree in human biology from the University of Kansas.

Mazen Zari , M.S.cs, R.R.T.
Vice President / Director of Operations

Co-founder and vice president of JCCT, Mazen has been involved in clinical research since 1998 primarily focusing on clinical trial coordination, management and regulatory submissions and approvals. He received his Master’s degree in Computer Science from the University of Kansas following completion of his B.S. in Respiratory Care at the University of Kansas Medical Center.

Carlos Fierro, M.D.

Dr. Fierro has served as the sub-investigator at JCCT since 2005. He’s been involved in clinical research trials since 2004 either as a Principal or Sub-Investigator. Dr. Fierro trained in Internal Medicine and Pediatrics at the University of Kansas, and holds a bachelor’s degree in Biomedical Engineering from M.I.T.