Who's the most shagadelic photog you've never heard of?
S. H. Lim.
This dude rocked the '60s, as you can see from these photos of, first, Phusadee Anukkhamontri:
And next, Christin Liang:
Scroll-down trivia that doesn't help you: Lim's real name was Vivat Pitayaviriyakul. More info here: S.H. Lim in Bangkok.