Francis Schaeffer (1912-1984) was an American theologian, philosopher, and Presbyterian pastor known for his influential writings and teachings on Christianity and culture. He founded the L'Abri community in Switzerland, where he engaged with students and seekers, addressing the relationship between faith and contemporary issues. Schaeffer authored several books, including The God Who Is There and How Should We Then Live?, which explored the decline of Western thought and the importance of a biblical worldview. His work emphasized the need for Christians to engage with culture and defend their beliefs in a rapidly changing society.