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Pediatric Care Providers

HallerMichael Haller, M.D.

Dr. Haller began working with Type 1 Diabetes (T1D) during his first year of medical school and has committed his academic career to developing safe and effective therapies for the prevention and reversal of T1D. Dr. Haller works with clinicians and researchers to develop a T1D cure. He has published over 30 manuscripts and book chapters about T1D and is the principal investigator of numerous intervention studies for T1D patients. He has received awards and research grants, including the prestigious Juvenile Diabetes Research Foundation (JDRF) Mary Tyler Moore and S. Robert Levine Excellence in Clinical Research Award, the Lawson Wilkins Clinical Scholar Award, a JDRF innovative research grant, an NIH R21 award, and a JDRF Early Career Clinically Oriented Award to support his work in developing combination therapies for T1D.


patrickShannon Patrick, ARNP, MSN

Shannon has been a practitioner with the Pediatric Endocrinology division since 2004 working with children, teens, and young adults with diabetes, pre-diabetes, and dyslipidemia. She worked at Shands Hospital at the University of Florida for many years in pediatrics, bone marrow transplant, and in the Post Anesthesia Care Unit while attending the University of Florida to obtain her Master’s degree in nursing. Shannon attends clinics, manages insulin regimens between visits, provides education to patients, their families and to other health care providers, staffs Florida Diabetes Camp sessions, and coordinates care with schools and other providers. Shannon enjoys helping young people with diabetes learn how to manage their diabetes so they can achieve their full potential and become productive and happy adults.


RohrsHenry Rohrs, M.D.

Dr. Henry (Hank) Rohrs is a vital part of the UF Diabetes Center of Excellence’s search to “Find the Cure.” He is an Assistant Professor at the University of Florida and works in Pediatric Endocrinology at Shands at UF. Dr. Rohrs works in three separate clinics related to finding a cure for diabetes: the Diabetes Clinic on Mondays and Thursdays, the Endocrine Clinic on Wednesdays and Fridays, and the Prediabetes and Lipid Clinic on Tuesdays.



Schatz 150x150Desmond Schatz, M.D.

Dr. Schatz has been involved in Type 1 Diabetes (T1D) research since the mid 1980s and has published over 180 manuscripts, mainly relating to the prediction, natural history, genetics, immunopathogenesis and prevention of T1D.  He is the principal investigator of multiple ongoing T1D clinical trials at the UF Diabetes Center of Excellence.  Recently he was awarded the Mary Tyler Moore and S. Robert Levine JDRF Excellence in Clinical Research Award with his colleagues Dr. Mark Atkinson and Dr. Mike Haller.  Dr. Schatz is in clinic on Wednesdays.


SilversteinJanet Silverstein, M.D.

Dr. Silverstein has varied roles as a diabetes clinician, and has served on several committees including the executive committee of the American Academy of Pediatrics and the Children’s Workgroup of the National Diabetes Education Program.  She has helped develop training and educational materials that can be used in schools to address the needs of children with Type 1 Diabetes (T1D).  Dr. Silverstein writes the Kids Corner, a monthly column in Diabetes Forecast, a publication for people with diabetes.  She has chaired the Council of Youth of the American Diabetes Association (ADA) and has worked with the ADA to develop standards of care for children with diabetes.


WeinsteinDavid A. Weinstein, M.D., M.M.Sc.,

Dr. Weinstein completed his medical education at Harvard Medical School and his residency, chief residency, and fellowship in pediatric endocrinology at Children’s Hospital Boston.  He obtained a Master’s degree in clinical investigation from Harvard and MIT and became Director of the Glycogen Storage Disease Program at Children’s Hospital Boston, which he brought to the University of Florida in 2005.  Dr. Weinstein’s research focuses on the mechanisms of long-term complications associated with patients who have glycogen storage disease into adulthood.


Jessica Ferguson RN, BSN

Jessica is coordinator for TrialNet at the UF Diabetes Center of Excellence. She oversees the TrialNet Type 1 Diabetes Natural History Study, the Oral Insulin Study, and other studies. Jessica joined the research team after serving as a diabetes nurse educator in pediatric diabetes clinic.



Gary Geffken, Ph.D

Dr. Geffken was the Program Director for two inpatient psychiatric pediatric programs: the Diabetes Project Unit for adolescents with difficult-to-manage diabetes and the Children Mental Health Unit for children with autism spectrum disorders. These inpatient programs were closed in December 2001 due to budget cuts and were restructured to be intensive outpatient programs. Dr. Geffken retained the role of Program Director for the intensive telehealth program; combining advances in technology with cutting edge treatment research in multidisciplinary approaches to adherence and health status in children and adolescents with difficult-to-manage-diabetes and their families. Dr. Geffken also has special expertise in the psychological treatment of obsessive compulsive disorder for both adults and in multidisciplinary approaches to adherence and health status in children and adolescents with difficult-to-manage-diabetes and their families. For more information on Dr. Gefken, please click here.

Shannon Lyles, BSN, RN, CDE

After joining the University of Florida Department of Pediatric Endocrinology in 2002 as a Registered Nurse Specialist, Shannon became a Certified Diabetes Educator in 2005, and now teaches newly diagnosed and established patients, caregivers, and school nurses about diabetes management. Shannon sees patients for routine clinic visits, coordinates the insulin pump program, develops educational material, and many other things to help improve the lives of her patients living with diabetes. Since 1998 Shannon has volunteered with Florida Camps for Children & Youth with Diabetes (FCCYD), participating in various weekend and weeklong programs throughout the year. Shannon has served on the Medical Advisory Board and is currently on the Board of Directors. Shannon obtained her BSN degree from the University of Central Florida.


William Winter, MD

Dr. Winter’s research activities in type 1 diabetes then brought him into the Department of Pathology at the University of Florida (UF). His research interests currently include autoimmunity in type 1 diabetes and unusual forms of diabetes in minorities. He is presently the principle investigator for the NIH-sponsored Type 1 Diabetes TrialNet Islet Cell Autoantibody Core Laboratory. Combining articles, chapters, and abstracts, he has contributed nearly 200 publications that deal with chemistry, coagulation, diabetes, endocrinology, and immunology. Dr. Winter holds boards in pediatrics, pediatric
endocrinology, clinical chemistry (American Board of Clinical Chemistry), and chemical pathology (American Board of Pathology).