Jim Marshall was known as one of the great rock and roll photographers. You might visit visit http://www.marshallphoto.com/ to get some sense of his iconic images of such folk as Jimi Hendrix, Bob Dylan, Janis Joplin, Miles Davis and Thelonious Monk.
Obituaries have appeared in the NY Times, SF Chronicle and Rolling Stone and you can easily reach their websites. The outstanding photographic blog site, The Online Photographer had a marvelous remembrance of him by the photographer Ctein, who also did printing for him. Here is the link to that story.