Norman Geisler (1932-2019) was an influential American theologian, philosopher, and author known for his work in Christian apologetics. He co-founded the Southern Evangelical Seminary and wrote over 90 books, addressing topics such as the existence of God, the reliability of the Bible, and moral philosophy. Geisler was a prominent advocate for the inerrancy of Scripture and contributed significantly to debates on Christian doctrine. His teachings emphasized the importance of reason and evidence in faith, making complex theological concepts accessible to a broader audience. His legacy continues to impact students and scholars in the field of apologetics.