Albert Jonsen, PhD,is one of the world's leading experts on clinical ethics. Professor Emeritus at the UCSF School of Medicine, Dr. Jonsen developed the four-topic" approach to medical ethics that is more explicitly clinical and real world than the established approaches to the subject.Mark Siegler, MDis Professor of Surgery at the University of Chicago and also a nationallyrenown expert on clinical ethics.William Winslade, PhD, JD,is nationally known as a bioethicist and is Professor at theUniversity of Texas Medical Branch.