Henry Drummond (1851–1897) was born in Stirling, Scotland, and was educated at Edinburgh University. In 1877, he became a lecturer on natural science at the Free Church College of Glasgow. Drummond was a geologist and an explorer, and he spent a portion of time away from the classroom on scientific expeditions. As a Christian, he combined his knowledge of science with his understanding of God the Creator and His diverse creations. Beyond his work as a scientist, Drummond desired to see men and women come to Christ. He accompanied Dwight L. Moody on many of his revival missions in England and Ireland, and he presented an address on biblical love during this time that deeply affected Moody. Drummond wrote several works on science, but his most famous and enduring book, based on that address on love, is The Greatest Thing in the World.