Though a famous theologian, I was a mathematics professor at Cambridge from 1662 to 1670.
I was the primary mentor for Isaac Newton, who succeeded me in my teaching position (the Lucasian chair).
I disliked the formalism of algebra, in fact I thought that algebra should be a part of logic rather than mathematics.
A fan of the ancients, I edited the works of Euclid, Apollonius, and Archimedes.
Some claim (including myself) that I originated the idea of a chord on a curve "limiting" into a tangent line whose slope represents the instantaneous slope of the curve at the point of tangency.
Isaac Barrow (1630-1677)