Start here with a look around this electronic archive site dedicated to O'Neill: eOneill.com. You might check out the study companion there for The Iceman Cometh. Our class member Bill pointed out this particular essay: Mannheim On O'Neill. Thanks, Bill! More to follow.

Photo credit: Library of Congress, Prints & Photographs Division, Carl Van Vechten Collection, [reproduction number, e.g., LC-USZ62-54231]