Edward Hitchcock (1793 -1864) was one of the first American geologists of importance, making important studies on glacial geology and serving many years as a Massachusetts state geologist. He was another man strongly influenced by Timothy Dwight, having studied under Professor Silliman.

George John Romanes (1848-1894) was a follower and personal friend of Charles Darwin, as well as author of many books promoting evolution. He was a gifted biologist and physiologist, as well as a zealous evolutionist. But he also went through a unique pilgrimage of faith in his own life.

Georg Friedrich Bernhard Riemann (1826 -1866) was a German mathematician who developed the concept of non-Euclidean geometries.

Joseph Lister, First Baron Lister (1827 -1912) was an English surgeon whose great contribution was the development of antiseptic surgery through the use of chemical disinfectants.

Gregor Johann Mendel (1822 -1884) may seem out of place in this list at first, since we know little of his personal beliefs. However, he chose a monastic calling at a time when this certainly included belief in the basic doctrines of Christianity. He was a creationist and rejected Darwin's evolutionary ideas, although he was quite familiar with them.