High Quality Content by WIKIPEDIA articles! Alexander Grothendieck (German: ; French: ; born 28 March 1928) is a mathematician and the central figure behind the creation of the modern theory of algebraic geometry. His research program vastly extended the scope of the field, incorporating major elements of commutative algebra, homological algebra, sheaf theory, and category theory into its foundations. This new perspective led to revolutionary advances across many areas of pure mathematics.