Kikuzo Ohashi entered Nihon Oil & Fat Manufacturing Company and became chief of its Inspection Section, superintendent of Kawasaki Paint Factory and then director (1944). When the company was amalgamated into Nissan Kagaku Kaisha (Nissan Chemical Industry Company) was appointed its director (1945). When Nihon Fat & Oil Company separated itself from Nissan Chemical Industry Company became managing director of the former company (1949). He went to USA to inspect synthetic rosin and oil and fat industry (1950).
He holds additional posts of councilor of Industrial Rationalization Council, councilor of Colored Lumber Association and Japan & Fat Industry Society) and permanent councilor of Japan Chemical Society.