I love the Kingston Trio! Another group from the same era was the Chad Mitchell Trio, and when Chad Mitchell left they just called it the Mitchell Trio and the young high lead that nobody had ever heard of before that sang in that group was a young fella by the name of John Denver.
Did he ever return? (no he never returned) - oops, guess that wasn’t Chad Mitchell . . . .
When Dave Guard left the Kingston Trio he formed the Whiskey Hill Singers with Judy Henske - a really great group but only one album. Great stuff, if you can find it.