Meet Our Team of Professionals in Lincoln

Celerion’s team is made up of professionals dedicated to providing the highest quality of care for participants. Each study team is led by a full-time physician who is the Principal Investigator for the study. Our Principal Investigators have extensive experience working in the medical community.

The exceptional physicians, specialists and nurses at Celerion are focused on one commitment: to provide the highest quality care and the best quality of stay for participants.

Our participants are our partners in the clinical study process, and this relationship is at the core of our approach to research and health care. If you have any other questions, please Contact Us today!

Principal Investigator 

A Principal Investigator is a doctor who leads the clinical research team and, along with the other members of the research team, regularly monitors study participants’ health to determine the study’s safety and effectiveness.

Charles S. Tomek, MD

Principal Investigator

Dr. Tomek joined Celerion in June 2010 with over 25 years of  active Clinical Research, Emergency Medicine Physician in hospitals in Omaha and Lincoln Nebraska. Dr. Tomek earned his Medical Degree from the University of Nebraska College of Medicine, Omaha and completed his residency in Pennsylvania.

Allen Hunt, M.D.

Principal Investigator

Dr. Hunt joined Celerion in September of 2017 with nearly 30 years of Family Practice with Obstetrics and Emergency Room practice in Valentine, NE.  He also served as Medical Director and an Urgent Care Physician in Lincoln, NE.  Dr. Hunt earned his degree from the University of Nebraska Medical Center in Omaha, NE.  He completed his residency at Lincoln Medical Education Foundation in Lincoln, NE.

Jonathan A. Stelling, MD

Principal Investigator

Dr. Stelling joined Celerion in June 2025 with 31 years of clinical experience in Family Practice with Obstetrics and Emergency Medicine.  He practiced in Nebraska City, NE for 24 years with the last 11 years being exclusively in Emergency Medicine before practicing Emergency Medicine in Beatrice, NE for 7 years.  Dr. Stelling earned his medical degree from the University of Nebraska Medical Center in Omaha, NE.  He completed his residency at Lincoln Medical Education Foundation in Lincoln, NE.

J. Tyler Martin, MD

Principal Investigator

Dr. Martin joined Celerion in July of 2025 after working for 30 years in Biotech/Pharma companies. He served in a variety of roles from Clinical Director to Chief Medical Officer to CEO in both public and private companies. Dr. Martin led teams that filed more than 100 INDs and obtained 4 FDA approvals. He earned his degree and completed his residency at the University of Nebraska Medical Center and was a post-doctoral fellow in Infectious Diseases and Molecular Microbiology at Washington University in St. Louis.

Study Participant Representative
Study Participant Representatives assist with the participant registration process and pre-screening for studies prior to the screening appointment. This team confirms screening appointments and contacts participants regarding new study opportunities.

Admissions Specialist
Admissions Specialists coordinate the screening functions of each study. They work with the Principal Investigator to help ensure participants are qualified to participate based on their medical history and screening results. A member of the Admissions team welcome participants at each screening visit and are the main contact until study check-in.

Screening Conduct Associate
At the screening visit Screening Conduct Associates complete the informed consent process and other screening assessments including measuring height, weight, temperature, blood pressure, and pulse as well as taking biological samples such as blood and urine. A Screening Conduct Associate will also complete the electrocardiogram (ECG), if required, during screening.

Study Manager
A Study Manager is the main point of contact for participants throughout a study. Study Managers welcome all participants at check-in when the study orientation is given, and are responsible for organizing the conduct throughout the study.

Clinical Research Nurse
Our team of nurses work closely with the Principal Investigators to monitor and ensure the safety and well-being of participants. Our nurses perform vital signs, electrocardiograms (ECG), and other study procedures as required.

Clinical Conduct Associate
Clinical Conduct Associates monitor study participant activities and respond to their needs. These associates record study data and collect biological samples such as blood and urine. Additionally, their duties include taking vital signs, monitoring meals, performing electrocardiograms (ECG), and conducting height and weight measurements.