I have additional Greenbriar Boys information. I knew them in the late 50's and early 60's when they were John Herald, Ralph Rinzler and Bob Yellin but at this year's Philly Festival, Eric Weissberg told me that he had been an original member (with John and Bobby) and, when he left to join the Tarriers in 1957, he was replaced by Paul Pretapino, who was replaced by Ralph. Paul Prtestapino later worked as accompanyist for the Chad Mitchel Trio and, I think, for Judy Collins (or was that Steve Mandel?) In the mid 60's Bobby Yellin moved to Israel, married, changed his name to David and performed with his wife, Yona. They had a popular recording of a song for immigrants called "Tsarik Lilmod Ivrit", which means You Have To Learn Hebrew. They lived on a kibbutz called Endor and I often came over to jam. Nobody on my kibbutz could play bluegrass, either. Before the festival, I hadn't seen Eric for twenty years and we spent hours playing "Do you remember..." and "What ever happened to....". Nostalgia is one of the few pleasures of dotage.