Bernhard Bay, chemist, obtained the degrees Master of Arts (MA) and Doctor of Philosophy (PhD). In 1903 he resided in Johannesburg and became a member of the Chemical, Metallurgical and Mining Society of South Africa. Shortly afterwards he contributed two papers to the society's Journal (1904/5, Vol. 5): "The formation of the white precipitate in the precipitation boxes of cyanide works" and (as co-author with Professor August Prister*) "Studies on the white precipitate formed in the zinc boxes of cyanide works".
Bay was a member of the South African Association for the Advancement of Science by 1906. He was still listed as a member in 1910, but no address was known for him. In 1908 he was in the process of becoming a naturalised citizen of the Transvaal Colony.