Dr. Bruce G. Rankin is the Medical Director at Accel Research Site Deland, which conducts Phase 1-4 clinical trials. He has been in medical practice in the Deland area for over 35 years and has served as an investigator with Accel Research Sites since 1998 during which time he has conducted over 500 clinical trials. His experience includes trials for vaccines, Alzheimer’s, diabetes, cardiovascular, neurologic, arthritis, infectious disease and pain treatment indications.

Dr Rankin is a Fellow of the American College of Osteopathic Family Physicians (FACOFP), certified clinical investigator by the Association of Clinical Research Professionals (CPI), and is a diplomate of the National Board of Osteopathic Medicine. He has served as past Chief of Staff at Florida Hospital Deland and is past President of the Florida Society of the American College of Osteopathic Family Physicians (FSACOFP). He is a Florida Delegate to the American Osteopathic Association (AOA) and serves on the Executive Board for the Florida Osteopathic Medical Society (FOMA). He was awarded Physician of the Year from FOMA in 2022.

Dr. Sarah A. Holder is a principal investigator at Accel Research Sites. Dr. Holder has over 30 years of experience in private practice as an OB/GYN and joined Accel Research Sites in 2021. Her areas of expertise include OB/GYN and women’s health studies. Prior to joining Accel, Dr. Holder spent 10 years working in research with IC Research.

Dr. Holder received her bachelor’s degree in psychology from the University of Michigan and earned her medical degree from Wayne State University School of Medicine in Detroit.  Her residency in OB/GYN was completed at St. Joseph-Mercy Hospital and The University of Michigan in Ann Arbor, Michigan.

Michael Hoffmann M.D. – Dr. Michael Hoffmann is both an M.D. and PhD and is board-certified in Neurology and a Diplomate in Electroencephalography and Neurophysiology. Aside from having practiced medicine for over 35 years across 3 continents, Dr Hoffmann has been involved in research for the last 12 years. He joins our team of 4 providers with 32 previous research studies conducted, 15 as PI. As an advocate for education, Dr Hoffmann received an Excellence in Teaching Award from the Department of Neurology/Internal Medicine at the University of Central Florida in 2019. His passion for the advancement of medicine is palpable and Dr Hoffmann truly embodies the drive for clinical research conduct.

Daniel Gottlieb M.D. – Dr. Daniel G. Gottlieb is a board-certified family medicine physician with a diverse background spanning clinical practice, medical education, media production, and public health advocacy. He holds a Doctor of Medicine from Emory University and a BA in French Literature and Anthropology, with extensive training in geriatrics, chronic disease management, and integrative care. Over the years, he has served in roles ranging from hospitalist and clinic director to medical educator and producer of geriatric learning tools. Prior to medicine, Dr. Gottlieb held leadership positions in media and environmental education, notably contributing to Turner Broadcasting’s “Captain Planet” initiatives. His publications and teaching experience reflect a commitment to blending education, prevention, and holistic care. Fluent in French and certified in advanced SCUBA diving, he is now seeking to transition into research medicine, focusing on geriatric care and chronic condition treatment innovations.