He was a German mathematician, known for his work in complex analysis.

Known for: Cauchy–Schwarz inequality, Schwarz lemma, Schwarz integral formula, etc.

He was a German mathematician who worked on elliptic, abelian, and theta functions.

Known for: Schottky groups, Schottky's theorem, etc.

He was a Polish-German mathematician, who made contributions to the areas of differential equations, conformal mappings, and potential theory.

His biography can be found here.

He was a Hungarian mathematician, who was one of the founders of probabilistic number theory.

Known for: Jessen–Wintner theorem, Wiener-Wintner theorem, etc.

He is an American mathematician known for his work in geometry, particularly symplectic geometry and Lie theory.

Find more details here.

He is an Indian mathematician, specializing in differential geometry.

Known for: Kulkarni limit set, Kulkarni–Nomizu product, etc.

He is an Indian mathematician, specializing in hyperbolic geometry and group theory.

Find more about him here.