Bob Grossman.
Originally from Los Angeles. Recorded an album for Elektra around 1963, and was featured on an Elektra folk sampler with Judy Collins, Theo Bikel and the Limeliters.
The good news: He's alive and well and, as Robert Grossman, has been a stage actor many years, doing a lot of work in Detroit and a few other cities.
Better news: He has recorded another CD, only 40 years later. It's tremendous. Whether he'll release it is another question, as is whether he'd want me to say anything more about it.