Rebecca Ruebner, MD

Dr. Arik Marcell is a tenured professor of pediatrics at the Johns Hopkins University School of Medicine. His areas of clinical expertise include adolescent medicine, male reproductive health and pediatrics. Dr. Marcell holds a joint appointment in the Department of Population, Family and Reproductive Health at the Johns Hopkins Bloomberg School of Public Health. He earned his M.D. from the University of Illinois College of Medicine and his M.P.H. from the Johns Hopkins Bloomberg School of Public Health. He completed his residency at the University of Wisconsin Hospital and Clinics and fellowship in adolescent medicine at the University of California in San Francisco. Dr. Marcell has led updates to the nation's Title X guidelines on men’s health for clinical preventive service recommendations on family planning and sexual and reproductive health. He directs the Title X program at the Harriet Lane Clinic and recently received funding from the Office of Family Planning to integrate rapid HIV testing in the clinic. Dr. Marcell is faculty sponsor for the Bloomberg School of Public Health’s certificate in adolescent health. His teaching excellence has been recognized from the Bloomberg School of Public Health for his course on Masculinity, Sexual Behavior, and Health- one of the only men's health-focused courses being taught in the nation in a public health school.

Dr. Hammond is an Assistant Professor of Psychiatry at Johns Hopkins University Department of Psychiatry with a joint appointment in the Division of Child & Adolescent Psychiatry and Behavioral Sciences and the Behavioral Pharmacology Research Unit (Affiliate). He completed his M.D. at University of Florida and his Ph.D. and residency/fellowship training at Yale University. Dr. Hammond’s research program focuses on characterizing the neurobiological predictors and mechanisms of treatment response for adolescent substance use disorders (SUDs) using multimodal neuroimaging (MRI, EEG) and large-scale brain network analytic approaches. His research is funded by a NIDA/AACAP Career Development Award (K12DA000357). Dr. Hammond’s research group is embedded in a larger collaborative research network within Johns Hopkin University School of Medicine applying translational neuroscience, clinical, and epidemiological methods to improve our understanding of brain-behavior relationships for youth suffering from substance use and mental health problems and aid in designing better evidence-based interventions. Clinically, Dr. Hammond works with youth (ages 13-25) with co-occurring substance use and psychiatric disorders in his role as Medical Director of the Co-occurring Disorders in Adolescents and Young Adults (CODA) Clinic at Johns Hopkins. He currently serves on the AACAP’s Substance Abuse and Addictions Committee and the American Academy of Addiction Psychiatry’s Youth and Adolescent Addiction Treatment Committee.

Dr. Meredith Atkinson is an associate professor of pediatrics in the Johns Hopkins University School of Medicine. She provides care for children with kidney problems of any type, including patients on dialysis; patients with proteinuria, hematuria and chronic kidney disease; and kidney transplant. Dr. Atkinson's clinical research interests focus on chronic kidney disease and end-stage kidney disease in children. Her specific interests include mechanisms and treatment of anemia in chronic kidney disease and racial disparities in patient outcomes. She is the recipient of numerous research grants and awards, including a K23 Patient Oriented Research award from the National Institute of Diabetes and Digestive and Kidney Diseases/NIH, and young investigator grants from the National Kidney Foundation, the National Kidney Foundation of Maryland, the Thrasher Research Fund and Amgen Inc. She is currently the PI of the Renal Anhydramnios Fetal Therapy (RAFT) trial. She received her undergraduate degree in biology from Mount Holyoke College. She earned her M.D. from the University of Rochester School of Medicine and Dentistry. She completed a residency in pediatrics at Johns Hopkins, followed by a fellowship in pediatric nephrology at Hopkins, completed in June 2007. During her fellowship training, Dr. Atkinson received a master’s degree in epidemiology from the Johns Hopkins Bloomberg School of Public Health. Dr. Atkinson joined the Johns Hopkins faculty in 2007. Dr. Atkinson was elected to the Society for Pediatric Research in 2014. She is a member of several professional organizations including the American Society of Nephrology, and is the president of the American Society of Pediatric Nephrology for 2024-2026.