In 1964 Fomin became professor in the Department of the Theory of Functions and Functional Analysis and two years later he was appointed as a professor in the Department of General Control Problems.
Sa 1964 Fomin ay naging propesor sa Kagawaran ng teorya ng pag-andar at pagganap ng Pagtatasa at dalawang taon mamaya siya ay hinirang bilang isang propesor sa Kagawaran ng Pangkalahatang Control Problema.