I recall attending the Leeds University Folk Club (among others) around 1964/5. The very first time I ever saw what we, in those days, wrongly called the "clawhammer" style (it was really Travis-type picking) was when a young guitarist called Stefan played and sang a version of "The Golden Vanity". We rushed back to student digs transfixed and got to work on it as fast as we could.

I learned, many years later, that the guitarist was called Stefan Sobell. I confirmed this by email correpondence with Stefan recently and he admitted that the young maestro was indeed himself.