I read his articles all the time. He's one of the best boxing writers out there. He as actually written a total of 16 books.

Muhammad Ali: His Life and Times
Mark Twain Remembers
The Black Lights
Knockout
Muhammad Ali: Memories
Muhammad Ali: In Perspective
A Beautiful Sickness
A Year At The Fights
The View From Ringside
Muhammad Ali & Company
Brutal Artistry
Chaos, Corruption, Courage, Glory
I Don’t Believe It But I Know It’s True
The Lost Legacy of Muhammad Ali
The Greatest Sport of All
The Boxing Scene