Jeffrey Mass

Jeffrey Paul Mass (June 29, 1940 – March 30, 2001) was an American academic, historian, author and Japanologist. He was Yamato Ichihashi Professor of Japanese History at Stanford University.

Mass was born in New York City in 1940. He earned a bachelor's degree in history from Hamilton College in 1961, a master's degree in history from New York University in 1965, and he received his doctorate in history from Yale in 1971.

Mass joined the Stanford University faculty in 1973. He was made a full professor in 1981.

After 1987, he spent the late spring and summer of each year teaching at Oxford University.

During many years, his research was supported by a Fulbright Research Fellowship, a Mellon Fellowship and a Guggenheim Fellowship, and other grants.

In an overview of writings by and about Mass, OCLC/WorldCat lists roughly 30+ works in 110+ publications in 3 languages and 5,000+ library holdings.

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• Warrior government in early medieval Japan: a study of the Kamakura Bakufu, shugo and jitō, 1974
• The Kamakura bakufu: a study in documents, 1976
• The development of Kamakura rule, 1180-1250: a history with documents, 1979
• Court and Bakufu in Japan: essays in Kamakura history, 1982
• The Bakufu in Japanese history, 1985
• Lordship and inheritance in Early Medieval Japan: a study of the Kamakura Soryō system, 1989
• Antiquity and anachronism in Japanese history, 1992
• The origins of Japan's medieval world: courtiers, clerics, warriors, and peasants in the fourteenth century, 1997
• Yoritomo and the founding of the first Bakufu: the origins of dual government in Japan, 1999