When Leopold Weiss left Austria at age 22 to visit an uncle in Jerusalem, he was spiritually adrift, disillusioned by Europe's materialism. He found the Muslim world an unexpected tonic: Its complexities, temperament and sense of spiritual security intrigued him. He stayed on, traveling, reading and conversing widely, and became a celebrated foreign correspondent. Then, one day in the Berlin subway, Islam embraced him. He became a Muslim and took the name Muhammad Asad. Over the decades that followed, he became the most articulate and passionate of scholar-converts, devoted to the regeneration of his adopted faith and its reconciliation with the modern world. At 80, he completed his English-language version of the Qur'an, with commentary, which has become a classic; his landmark autobiography, reissued this year to mark the 10th anniversary of his death, recounts his spiritual travels. No other westerner has recorded a journey into Islam with so much insight and love.