Mark A. Jacobson, MD, is an emeritus professor of medicine at the University of California San Francisco and was an attending physician at San Francisco General Hospital from 1986 to 2024. He began his internship in 1981, just days after the CDC first reported a mysterious, fatal disease affecting gay men. Dr. Jacobson was a clinician at the Ward 86 HIV clinic at San Francisco General Hospital, educator, and researcher who specialized in HIV/AIDS and its complications after joining the UCSF faculty in 1986. His earlier career involved developing effective treatments for AIDS-associated opportunistic infections. His subsequent research investigated protective immunity against chronic viral infections, in particular cytomegalovirus (CMV). Since 2020, he has been part of the occupational health team at SF General More information that manages employee COVID-19 testing, vaccination, and work isolation. More about Dr. Jacobson is available at UCSF faculty Sensing Light, published by Ulysses Press, is his first work of fiction.