David H. Johnson

Dr. Sandra Horning and Dr. David Johnson are both oncologists. Horning is the current president of the American Society of Clinical Oncology, the largest group of cancer-treatment specialists. Johnson was president before her. Both of them are cancer survivors — the first to lead the 41-year-old society. Horning practices and does research on lymphomas at Stanford. She is also co-chairman of the oncology society's task force on cancer survivorship. Johnson is deputy director of the Vanderbilt-Ingram Cancer Center in Nashville, Tenn.