Research Team

CMR has over 35 combined years of clinical trial experience which includes our team of highly trained coordinator staff to oversee all site activities.

Additional ancillary personnel includes:

  • Registered Dietician
  • Certified Diabetes Educator
  • Physical Therapist
  • Psychologist

viviana2Viviana Hargis, RN CCRC

Senior Research Coordinator

Viviana Hargis received her nursing degree from Chattanooga State Community College in 2001. She has been involved in conducting clinical trials for greater than 8 years. Her therapeutic expertise areas are obesity, diabetes, fibromyalgia, hot flash and hpv vaccine and insomnia.

Viviana is CITI and ACRP certified. She has a commitment to quality in clinical research.

kamri2Kamri Chester, B.S.

Clinical Research Coordinator

Kamri received her Bachelor of Science Degree in Biology from the University of Memphis, Memphis, TN. She started her internship the summer of 2008. Kamri is focusing on the following clinical trials oral contraceptives, HPV and Type II Diabetes. She has received CITI & Bio Hazard Shipping training.

brooke2Brooke Sigler, CMA

Clinical Research Coordinator

Brooke Sigler, carries a Medical Assistant Certification. She has worked in the women’s health area since 2006. Her research coordinating experience includes oral contraceptives, upper respiratory infection, intrauterine device and various other therapeutic areas. She previously held the position of Regulatory Specialist and Administrative Assistant.

rachel-webRachel Thomas, B.A.

Clinical Research Coordinator

Rachel recently earned her Bachelor’s degree in Biology from Covenant College.  She joined the CMR team in 2014 as a Clinical Research Coordinator.  She is presently involved in various Women’s Health pharmaceutical based clinical trials.   With her  deep interest in biomedical research.  Rachel  hopes to eventually attend graduate school for Immunology.   She has completed all required training and certification to conduct pharmaceutical trials.

rejeana-144x150Rejeana Ricks

Clinical Research Coordinator

Rejeana  rejoined the Chattanooga Medical Research team in 2014.  She was previously employed at CMR for 4 years before she relocated to North Carolina.  She has been in the research arena for a total of 12 years.  She is presently involved in Women’s Health Studies. She has completed all required training and certification to conduct pharmaceutical trials.

melinda2Melinda Roddy

Clinical Research Coordinator

Melinda Roddy began her career in healthcare in 1998 and has worked in the Women’s Health field since 2000. Her experience in research includes studies in Women’s Health and Cardiology. She has received CITI and Mayo Medical Lab certifications.

In addition, Melinda has received her real estate license and is a part time real estate agent.

landria2Landria Sheffey

Clinical Research Intern

Landria is a graduate of Muscle Shoals High School and the University of Alabama at Birmingham in Alabama where she earned a Bachelor’s in Community Health Education and a minor in Medical Sociology. Landria is currently pursuing a Master’s degree in Public Health from Mercer University in Atlanta, Georgia and a post graduation certificate in Clinical Research Management from the University of Alabama at Birmingham.

She is currently participating in CMR’s clinical research internship program. Landria is also a Board Member of a nonprofit charity (Angie’s Caring Hearts Foundation, Inc.) that was established in memory of her maternal grandmother to provide service and aid to senior citizens and low-income families in Sumter County, Alabama.

Landria believes that “If there’s a dream in your heart, follow it; and if a difference is to be made, make it”!


seth2Jonathan (Seth) Mayberry, BA, CRC

Seth Mayberry received his Bachelor of Arts in Biology, with a concentration in Health Professions, from Covenant College. He has been involved in several clinical research studies in a variety of areas, including treatment of Acute Surgery-Related Pain, Diabetes, and Women’s Health. Seth’s eventual goal is to research and develop non-drug therapies for medical conditions that are otherwise expensive or dangerous to treat.


marina2Marina Dunayeva, BA, CRC

Marina has recently received her Bachelor’s degree in Biology from Covenant College. She is eager to continue pursuing her love for science and its methodologies through clinical research.  She is presently involved in GI and Women’s Health Trials. Also, Marina has completed all the required training to conduct clinical trials.  In her spare time, she enjoys reading and visiting her family in sunny Florida.