Latter half of the 19th century:
Logan Martin (Borden, IN), James A. Little (Cartersburg, IN), Samuel Miller (Bluffton, MO), F. O. Harrington (York Center, IA), and James Troop (Purdue University)
More recently:
J. C. McDaniel (Univ. of Illinois), James Claypool, Jerry Lehman, and Don Compton