Charles Lyell (1797 - 1875)
Lyell carried Hutton's gradualism farther, into uniformitarianism, the notion that geological processes are uniform through time. From example, the processes that built mountains were balanced by the erosion of mountains. Lyell was educated as a lawyer, wrote Principles of Geology and had strong influence on Charles Darwin by acting as a mentor of sorts. Darwin remarked "I always feel as if my books came half out of Lyell's brain, and that I never acknowledge this sufficiently" [Morris 1989, 167 quoting Himmelfarb] [Cambell 1987, 427]
Photo Credits:
http://russellmcneil.blogspot.com/2007/09/charles-lyell-1797-1895.html
http://www.pbs.org/wgbh/evolution/library/02/4/image_pop/l_024_01.html
http://www.sc.edu/library/spcoll/nathist/darwin/darwin2.html