Kraemer, Joel. Maimonides: The Life and World of One of Civilization's Greatest Minds.  Doubleday, 2008/Random House 2010.

From the publisher:

“This authoritative biography of Moses Maimonides, one of the most influential minds in all of human history, illuminates his life as a philosopher, physician, and lawgiver. A biography on a grand scale, it brilliantly explicates one man’s life against the background of the social, religious, and political issues of his time.”

Online:
Penguin Random House
AbeBooks
Libraries: WorldCat
Amazon