Once again, the lack of inflection on the web gets me.
I thought it funny because "Snowdon Sittings" is a book I look at literally every week, you'd think I could spell his name!
Yousuf Karsh is my favorite. He may have used reflectors though, I can't recall.
I'm pretty sure he used continuous light photofloods, which is still artificial light.
Eve Arnold does it for me..
And also, Judith Joy Ross. I've chosen one her photos for an assignment in my Photo level 2 class.
Nobody has mentioned Disfarmer.....