Muhammed: A Prophet for Our Time (c2006) is Armstrong's second biography of Muhammed. Her first was Muhammed: A Biography of the Prophet (published in 1991). Armstrong writes in the introduction to the second biography that "in the wake of September 11, we need to focus on other aspects of Muhammad's life. So this is a completely new and entirely different book, which, I hope, will speak more directly to the terrifying realities of our post-September 11 world." (p. 7)