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In [[1630]], he founded a Hayashi clan school which would later become the [[Shoheizaka gakumonjo|Shôheizaka gakumonjo]], a major center of Confucian learning for shogunate and [[han|domain]] officials. He added a Confucian shrine, the Senseiden, to the complex in [[1632]].

In [[1630]], he founded a Hayashi clan school which would later become the [[Shoheizaka gakumonjo|Shôheizaka gakumonjo]], a major center of Confucian learning for shogunate and [[han|domain]] officials. He added a Confucian shrine, the Senseiden, to the complex in [[1632]].

Razan is credited with the editing or compilation of numerous works, including the [[1643]] ''[[Kan'ei shoka keizuden]]'', a compilation of samurai genealogies completed alongside his son Hayashi Gahô. He was also involved in promoting the publication of ''Honzô Kômoku'', a Japanese version of the Chinese botanical and pharmacological encyclopedia ''[[Bencao Gangmu|Běncǎo Gāngmù]]''.

Razan is credited with the editing or compilation of numerous works, including the [[1643]] ''[[Kan'ei shoka keizuden]]'', a compilation of samurai genealogies completed alongside his son Hayashi Gahô. He was also involved in promoting the publication of ''Honzô Kômoku'', a Japanese version of the Chinese botanical and pharmacological encyclopedia ''[[Bencao Gangmu|Běncǎo Gāngmù]]''. Razan also composed a treatise against [[Christianity]] entitled ''Hai Yaso'' ("Rejecting Jesus").<ref>Watanabe Hiroshi, ''A History of Japanese Political Thought, 1600-1901'', International House of Japan (2012), 156.</ref>

Razan died in [[1657]]. His son Gahô inherited his positions as shogunal advisor, and as head of the Confucian school.

Razan died in [[1657]]. His son Gahô inherited his positions as shogunal advisor, and as head of the Confucian school.