Jakob Grommer (1879-1933). Born near Brest, then in
Russia. First a Talmud student with a keen interest in mathematics.
Came to Göttingen to study mathematics and obtained his
Ph.D. there. Worked with Einstein for at least a decade
(1917-1927) as his calculational assistant. He held a university
position in Minsk from 1929 on and later became a member of the
Belorussian Academy of Sciences. From his youth he was inflicted
with elephantiasis.