Dr. Krantz serves on the Clinical Advisory Board for the Cornelia de Lange Syndrome (CdLS) Foundation, the Foundation for the Advancement of International Medical Education and Research, and the Alagille Syndrome Alliance. In May 2004, a research team led by Dr. Krantz reported in Nature Genetics that they had identified a gene on chromosome 5 which, when altered, causes CdLS. Since 2002 he has been the course director for the Medical Genetic courses GC550 and 551. He regularly supervises students in clinic and provides thesis advising and mentoring.