Samuel M. Zwemer (1867-1952) was a missionary, author, and scholar renowned as a global authority on Christian missions. As an early leader in the Student Volunteer Movement, pioneered the Arabian Mission in Iraq and Bahrain. Afterwards he was based out of Egypt for many years, where he published the Moslem World Quarterly and became a global leader in Christian missions to Muslims for many decades. Later in life, he was appointed a chair of History of Religion at Princeton Theological Seminary. His biography is in itself an account of the revival of interest in missions to Muslims in the 20th century.//J. Christy Wilson (1891-1973) was a missionary in Tabriz, Iran for 22 years and succeeded Zwemer as professor of missions at Princeton Theological Seminary, where he taught for 20 years. He also authored "The Christian Message to Islam."//All of Pioneer Library's books are sustainably sourced, ethically extracted, and organically grown. We do not print unvetted or unedited library scans of public domain works. This book was completely re-typeset from a primary source, and all citations and spelling were updated to reflect today's standards.