iResearch Atlanta

Who We Are

iResearch Atlanta

is a multi-specialty clinical research center, located in Downtown Decatur, just one block from MARTA. We offer a beautiful, comfortable environment for our study volunteers, patients and caregivers.  We are dedicated to making a difference in our local and global community through the study of new medications for mental health and medical illnesses affecting our community.

Built by dedicated, experienced research professionals; our core team has extensive experience in pharmaceutical and medical device research. Committed to improving the quality of life for individuals in our area, we offer expertise across a wide range of therapeutic areas.

Heather Beitz

Director, Clinical Operations

Prior to co-founding iResearch Atlanta in 2010, Ms. Beitz has experience in both the pharmaceutical and medical device industry and more extensively the investigator site side of clinical research. At a mid-size medical device company she served as the Senior Director of Research for the US and Asia Pacific and then at a large healthcare and consumer product company, as the Director of Global Clinical Affairs.

Prior to her industry experience, Ms. Beitz spent more than 10 years at a large Phase I-IV investigator site. There she held nearly every position, from clinical research coordinator, to rater, to site director and business development. Prior to her departure, she served as Vice President/COO. During her tenure, Ms. Beitz managed the 24/7, 40-bed, in-patient unit and out-patient clinic with over 75 employees.

Ms. Beitz earned her Bachelor of Arts degree from Armstrong University and her Masters of Education from the University of South Carolina. She is published in the field of micro-organisms, anti-bacterials and surgical scrubs.

Sara Castle

Director, Business Operations

Prior to co-founding iResearch Atlanta, Ms. Castle spent most of her career as a clinical research consultant, living in New England and working for Biotech and Pharmaceutical companies. There she focused on implementing new electronic data capture (EDC) tools and educating users and new research personnel on ICH, GCP compliance and CFR guidelines.

In 2004, Ms. Castle earned her Certificate of Clinical Trials Management through Boston University. She then co-founded a consulting company focused on providing regulatory and training services to investigator sites and pharmaceutical companies. The training services assisted investigator sites in streamlining staff activities and moving from paper-based to computer-based processes and templates. The regulatory services enabled pharmaceutical companies to eliminate bottle-neck activities at investigator sites and expedited study start.

Core Clinical Team

iResearch Atlanta has assembled a team of highly experienced practitioners. Click the image of each clinician for an abbreviated bio. Full CVs are available upon request.

Register here to request full CVs and investigative experience.

Dr. Kimball A. Johnson, MD

Kimball Johnson, MD, is a board certified diplomate of the American Board of Internal Medicine, a Certified HIV Specialist by the American Academy of HIV Medicine.

She is also board certified by the American Board of Integrative Holistic Medicine. A 1987 cum laude graduate of Emory University School of Medicine, Johnson holds a Bachelor of Science in physical education from Taylor University, where she studied exercise physiology and biomechanics. She began her medical career after college as a paramedic at Grady Memorial Hospital, where she gained priceless experience in patient care.

Johnson is a diplomate of the American College of Physicians and the American Society of Internal Medicine. She has participated in numerous professional medical organizations, including the American Medical Association, the Southern Medical Association, the Medical Association of Georgia, the American Medical Women’s Association, the AIDS Research Consortium of Atlanta, the American College of Sports Medicine, and the American Academy of HIV medicine.

Johnson is specialized in Infectious Disease and has been a trailblazer in the HIV medical community at the onset of the epidemic through its peak in Atlanta and was involved in the original AZT and DDI clinical trials, which was just the beginning of research trials for Dr. Johnson. Johnson went on to serve as the Sub-I for Aids Research Consortium (ARCA) and worked on over 40 HIV trials as Sub-I, and 6 HIV trials as PI.

Since then Johnson has always been intrigued by infectious disease clinical trials, and when other physicians run away, she runs towards the disease. She has served on Rare Disease and Infections, and other clinical trials full time since 2009 as the Medical Director of iResearch Atlanta. Together iResearch Atlanta and Dr. Kimball Johnson have worked on over 150 clinical trials together and have randomized over 2698 patients into clinical trails for various disease states in Phase I-IV clinical trials

Johnson is a CrossFit Level 1 (CF-L1) Trainer. She was a team physician for the American College of Sports Medicine and served as a physician for the 1995 Ironman Triathlon World Championship. She was physician coordinator for the Peachtree Road Race medical team from 1997-2007, and was a volunteer physician for the U.S. Olympic Training Center in 1999.

She serves as a Principal Investigator



Dr. David C. Purselle, MD

Dr. David Purselle is a board certified psychiatrist with over 14 years of clinical experience in Atlanta, GA. He has worked in a variety of settings including outpatient clinics, emergency rooms, and inpatient units at the Atlanta VA Medical Center, Emory University Hospital, and Grady Hospital. He has also been involved with several clinical research studies studying the effectiveness of various antidepressants, antipsychotics, and lithium.

After graduating magna cum laude with a degree in biomedical engineering from Vanderbilt University, Dr. Purselle attended medical school at the University of Alabama School of Medicine and completed a residency in psychiatry at Emory University School of Medicine. He then earned a Master of Science in Clinical Research at Emory University in 2005.

Clinical Team

Rebecca Hilliard, FNP-C

Allison Coburn, RN, CNM, MSN

Ashley Cohen, PA

Office Team

iResearch Atlanta has assembled a team of professional and friendly people to assist you every step of the way.

Zach Mitchell

Business Operations / Recruit Director

Amanda Goza

Clinical Operations / CRC Lead

Tamara Nelson

Compliance Lead

Lori Dilks

Financial Controller

Abel Beck

Clinical Research Coordinator

Bailee Bunn

Research Assistant

Stacy Saunders

Research Assistant

Andrea Sierra

Research Assistant

Aleha Rhodes

Research Assistant

Chloe Jones

Research Assistant

Mia Brown

Research Assistant

Ruth Ann Steinbrecher

Research Assistant

Jenny Patton

Pharmacy & Laboratory Lead

Maria Ambrosetti

Site Regulatory / QA

Stephanie Hockenberry

Regulatory Specialist

Rachel Shear

Receptionist / Executive Assistant

Katie Prowse

Recruitment Lead

Chido Mataba

Recruitment Specialist

Sabrina Maxwell

Junior Data Coordinator

Sonya Edelstein


Rachel Barber

Community Outreach Specialist

Rakilah Pastor

Research Assistant

Monica Mahathre

Clinical Research Coordinator

Sharie Douglas

Research Assistant

Sarah Harrison

Research Assistant

Casey Chacona

Clinical Research Coordinator

Blanche Castle

Office Manager / Transportation