After resigning as Director General, from 1965 to 1977 he was Editor in Chief (主幹) of the prominent art historical journal Kokka (國華).
Beginning in 1950, he worked in the Applied Arts Section of the Conservation Division of the Committee for the Preservation of Cultural Properties (文化財保護委員会保存部美術工芸課), an external bureau of the Ministry of Education that was established this same year.
From 1972-1973, he served as Vice-Chairman (副会長) of the Comprehensive Scientific Research Committee on the Takamatsuzuka Tomb (高松塚古墳総合学術調査会).
[1] As a prolific scholar, Tanaka's published writings exhibit extensive range within the field of Japanese art history, including Buddhist art, narrative handscrolls, Yamato-e, ink painting, Rimpa, and Nanga, in addition to Song and Yuan Dynasty Chinese painting and calligraphy.
In addition to many book-length works and edited volumes, he also regularly published articles in academic journals.
[4] During his long career, Tanaka conducted research and in-depth investigations of a wide range of works of art, primarily Japanese and Chinese paintings.