Dr. Welling is the Joseph S. and Esther Handler Professor of Medicine, Nephrology, and Physiology at Johns Hopkins University School of Medicine. .Dr. Welling is an authority on the molecular bases of potassium and sodium balance, electrolyte disorders, and hypertension. His laboratory is recognized for elucidating how ion transport molecules in the kidney control salt balance and discovering how these molecules go awry in disorders of electrolyte homeostasis and blood pressure. He has a special interest in the interaction between diet and faulty genes.