Adam Francisco (who has a Ph.D. in Islamic-Christian relations from Oxford University) is professor of history at Concordia University in Irvine, California.
His work on the history of Islam is nuanced and informed. As one online bio notes, “He has a unique ability to see and understand both the difficulties facing Christians who wish to evangelize their Muslim friends and the Muslims who are being asked to come to Christ. Many of his unique insights come from personal experiences sharing his faith with Muslims.”
To get a taste, see the first couple of videos produced by Modern Reformation below, which provide some brief historical background.
If that whets your appetite, you can view four lectures he gave at Faith Lutheran Church in Capistrano Beach, California, on
The Muslim Worldview
Islamic Theology: Part 1
Islamic Theology: Part 2
Islam in America