Tadashi Mamiya was born in the Saitama Prefecture in Central Japan as the son of Take-ho Mamiya. In 1927 he became a student of Noda Kyuura. Three years later Mamiya was awarded first prize at the Emperor’s Exhibition with a picture showing a “Lophatherum thicket.” For the next 30 years he continued to win a number of prestigious awards. He was also active in organizing local exhibitions and became a member of the New Japanese Painting Group (Shin Nihonga Kenkyūkai). Together with others he founded the new Japanese Painting Association. He also supported young artists by initiating the New Artists Association (Shin Bijutsujin Kyoukai). A member of the Forest Art Association, Mamiya died in 1984. Most of his works have been collected by the Museum of the Saitama Prefecture.