 That's Dr. Margot Cushell, a professor of medicine at the University of California, San Francisco. She's also the division chief at the UCSF Center for Vulnerable Populations and is the director of the BENEF Homelessness and Housing Initiative. We did research in the early 2000s that showed that in the early 1990s, 11% of people experiencing homelessness in San Francisco were 50 and older.