Conversation so far:
What did Kareem Abdul-Jabbar write about?
He is also co-author of a comic book published by Titan Comics entitled Mycroft Holmes and the Apocalypse Handbook.
What recognition has he gotten for writing?
In November 2014, Abdul-Jabbar published an essay in Jacobin magazine.
What is he an activist for?
Abdul-Jabbar has also been a regular contributor to discussions about issues of race and religion.
What religions did he support?
CANNOTANSWER.

Question: What celebrities did he work with?
Self-contained rewrite: What celebrities did Kareem Abdul-Jabbar work with?