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Georgio Ricci-Curbastro
The mathematician who developed much of tensor calculus before Einstein found a use for it.
http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Ricci-Curbastro.html
Hermann Minkowski
A brief biography with quotations and a bibliography.
http://turnbull.dcs.st-and.ac.uk/~history/Mathematicians/Minkowski.html
Hermann Weyl
One of the first people to combine general relativity with the laws of electromagnetism
http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Weyl.html
Karl Schwarzschild
The man who solved Einstein's equations and predicted the existence of black holes
http://scienceworld.wolfram.com/biography/Schwarzschild.html
Karl Schwarzschild
A brief biography with reference to contemporary mathematicians and theories.
http://turnbull.dcs.st-and.ac.uk/~history/Mathematicians/Schwarzschild.html
Luigi Bianchi
A mathematician who developed many theorems regarding Riemannian geometry
http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Bianchi.html
Marcel Grossmann
A brief biography on Marcel Grossmann, a classmate of Einstein who was the first to find a connection between tensor calculus and the theory of relativity.
http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Grossmann.html
Willem DeSitter
Mathematician who studied solution to general relativity and developed DeSitter space
http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Sitter.html