Okay, let’s break this down. Edwin has a PhD in nursing, which is a significant qualification. His experience in healthcare management, gerontology, and patient advocacy are also in demand. However, his location in San Francisco, California, is a hub for tech and healthcare, but not necessarily a hub for nursing professionals. Median salaries for nurses in the US range from $60,000 to over $100,000 depending on experience and specialty. Considering his PhD, I would estimate his hourly rate to be on the lower end of the nursing spectrum, around $120 per hour, similar to what mid-level nursing professionals might charge in the Bay Area.