Theo Heller, M.D. is Chief of the Translational Hepatology Section, Liver Diseases Branch, NIDDK at the NIH. He received an M.D. from the University of the Witwatersrand, South Africa and then underwent residency training in Internal Medicine at Georgetown University Hospital. He was then a postdoctoral fellow with Dr. Robert Purcell at the NIH and subsequently a Gastroenterology fellow at the University of Maryland. His Hepatology Fellowship was with Drs. T Jake Liang and Jay Hoofnagle at the NIH where he has remained as faculty. Dr. Heller’s scientific interests cover clinical and translational work in humans and include factors causing the progression of liver disease, rare liver diseases, and the gut-liver axis. He has performed first in human therapeutic studies in hepatitis D. He has co-authored over 300 scientific manuscripts.