Grossmann, Marcel (1878-1936)
http://www-history.mcs.st-andrews.ac.uk/Biographies/Grossmann.htmlA brief biography the mathematician who, as his fellow student and friend, helped Einstein to understand the mathematical tools (mostly differential geometry) needed to formulate general relativity; from the MacTutor History of Mathematics Archive (University of St. Andrews).
Submitted in section: Physics: Relativity: People: Grossmann, Marcel (1878-1936)