WordNet sense 1 (Swiss chemist who synthesized DDT and discovered its use as an insecticide (1899-1965)):

Paul Hermann Muller

WordNet sense 2 (Swiss physicist who studied superconductivity (born in 1927)):

Karl Alex Muller

WordNet sense 3 (German physiologist and anatomist (1801-1858)):

Johannes Peter Muller

WordNet sense 4 (German mathematician and astronomer (1436-1476)):

Regiomontanus, Johann Muller

WordNet sense 5 (British philologist (born in Germany) who specialized in Sanskrit (1823-1900)):

Friedrich Max Muller, Max Muller

WordNet sense 6 (United States geneticist who studied the effects of X-rays on genes (1890-1967)):

Hermann Joseph Muller

WordNet sense 7 (a reflective thinker characterized by quiet contemplation):

ponderer, muser, ruminator

WordNet sense 8 (a heavy tool of stone or iron (usually with a flat base and a handle) that is used to grind and mix material (as grain or drugs or pigments) against a slab of stone):

pestle, pounder