I knew Jack in the late 60's and early 70's, spending summers in Aspen. He was my friend Jeffery's older brother. I'm sure he considered me more of a pest than a musician, but he occasionally listen to us of let us play with him. I remember being in the recording studio when he recorded his first album. Quite by accident, I found him on Facebook and connected with him in March, after 40 years,,,, by then he had already passed. What a loss!