Nikolai Grigoryevich Cholodny (Russian: Никола́й Григо́рьевич Холо́дный ; 22 June 1882 – 4 May 1953) was an influential microbiologist who worked at the University of Kiev, Ukraine in the USSR during the 1930s.He is known for the Cholodny–Went model, which he developed independently with Frits Warmolt Went of the California Institute of Technology.Despite being associated with the same theory, the two men never actually met.Cholodny worked in the A.V.