His obituary in the LA Times is here
Adrian Cargill for KPCC (back in 2016, on the occasion of his announcing his retirement from the River Project) profiles him here
An early poetic genius, a Princetonian, City Money (1966), his first book, inaugerated an extraordinary writing life. Among his collections, The Poetry Room (1971), News from Niman Farm (1976), Africa and the Marriage of Walt Whitman and Marilyn Monroe (1982),
Two poems from The River – here
Dear Oxygen, New and Selected Poems 1966-2011 was published in 2011 by the University of New Orleans Press
He was the author also of the cultural history, (Birth of the Cool: Beat, Bebop, and the American Avant-Garde (published by the Free Press in 2001)
Mention should be made also of his wide range of other work – interviews, articles, screenplays, documentaries, ghostwriting..
An example of his musical collaboration can be heard here
His interview with Allen conducted in 1991 for the Lannon Foundation can be found here
Another great soul leaves us. We remember his grace.