People

Bernoulli, Jakob (1654-1705)
Swiss mathematician (aka Jacque I or James I) brother of Johann Bernoulli. they are considered the most important founder of Calculus with the exception of Newton, the two had bitter arguments about the quality of each other's work.
http://www.treasure-troves.com/bios/BernoulliJakob.html

Bernoulli, Johann (1667-1748)
Pioneers in the field of calculus, appied the new tool to real problems, life was one of the most controversial of any mathematician, member of the world's most successful mathematical family, also known as Johannes, Jean or John.
http://www.shu.edu/projects/reals/history/bernoull.html

Lagrange - Joseph Louis Lagrange (1736-1813)
The greatest mathematician of the 18th century, in his letter, written at 19, to Euler, he solved the isoperimetrical problem, to effect the solution he enunciated the principles of the calculus of variations.
http://www.maths.tcd.ie/pub/HistMath/People/Lagrange/RouseBall/RB_Lagrange.html

Maclaurin, Colin (1698-1746)
Scottish mathematician who became a disciple of Newton, published A Treatise of Fluxions, developed method for expanding functions about the origin in terms of series now known as Maclaurin Series.
http://www.treasure-troves.com/bios/Maclaurin.html

Wallis, John (1616-1703)
Contributed substantially to the origins of calculus and was the most influential mathematician before Newton.
http://turnbull.dcs.st-and.ac.uk/history/Mathematicians/Wallis.html