Jonathan was my mentor, colleague, and friend through many years and many planets. I met him as a science writer, but was fortunate enough to share some of the "folkie" side of his life, including a recording session with Sandy Paton back in the late seventies, and a couple of Boarding Party performances. I met some of his friends --- Pete the Spy, where are you?-- listened to his music, shared sushi, and had many, many great times with him. Reading the reminiscences here has been a warm and fuzzy experience for me. Thank you all for sharing them. You folkies should be aware that the same sort of mass mourning is going on in the space science community. Science News will have a memorial for him in its March 1 issue, and on its website. He will be missed by many. Damn.