Charles M. Sheldon was an American pastor and author, best known for his influential book, In His Steps, published in 1896. This work popularized the phrase "What would Jesus do?" and encouraged readers to consider their actions in light of Christian values. Sheldon's writing emphasized social justice and the importance of living a life of service to others. Born in 1857, Sheldon was also a prominent figure in the Social Gospel movement, which sought to apply Christian ethics to social problems. He dedicated much of his life to addressing issues like poverty and inequality, advocating for a faith that actively engages with the world.