M. Fethullah Gülen is one of the most influential thinkers and authors of the Muslim world today. His ideas have inspired a social mass movement which has established schools, dialogue centers, and relief work in over 160 countries worldwide. A retired preacher currently residing in the US, Gülen has authored more than sixty titles on Islam, interfaith dialogue, spirituality, and peaceful coexistence, including Muhammad: The Messenger of God, Toward a Global Civilization of Love and Tolerance, and Emerald Hills of the Heart: Key Concepts in the Practice of Sufism. His official web site is www.fgulen.com