Otto Hölder
Otto Hölder German mathematician (1859–1937) best known for Hölder’s inequality and the Jordan-Hölder theorem (http://planetmath.org/JordanHolderDecompositionTheorem). Hölder also made many essential first steps in the then emerging study of groups. Some of his results include a complete
classification of the groups of order (http://planetmath.org/OrderGroup) , and ( and different primes) and are an early example of the power of the Sylow theorems
for finite group
theory.
He studied at the University of Berlin, got his doctorate from the University of Tübingen, and taught at the University of Leipzig.
The generalized mean is sometimes called the “Hölder mean”.