Question: Which mathematician joined Yale in 1991, Grigory Margulis or Boris Galerkin?
Sentence (from "Boris Galerkin"): Boris Grigoryevich Galerkin (Russian: Бори́с Григо́рьевич Галёркин , surname more accurately romanized as Galyorkin; 4 March [O.S. 20 February] 1871  – 12 July 1945), born in Polotsk, Vitebsk Governorate, Russian Empire, was a Jewish Soviet mathematician and an engineer.
Relevant evidence: Yes