Léi Fēng 雷豐 (1833–1888), zì Sōngcún 松存, hào Shàoyì 少逸 (universally cited as Léi Shàoyì 雷少逸), late-life self-style Lǚjú bùyī 侶菊布衣. Native of Sānqú 三衢 (modern Qúzhōu 衢州 in Zhèjiāng), with ancestral roots in Pǔchéng 浦城 in Fújiàn. He came from a medical family — his father Léi Yìxián 雷逸仙 had studied under Chéng Zhītiān 程芝田 — and built a wide-ranging practice across Zhèjiāng, Fújiàn, Jiāngxī, Jiāngsū, and Guǎngdōng. He was celebrated for the “three perfections” 三絕 of medicine, music, and calligraphy/painting; his studio was named Yǎnghè Shānfáng 養鶴山房.
His principal work is the Shíbìng lùn 時病論 (KR3eg002) in 8 juǎn, completed in Guāngxù 8 (1882) and printed the following year — a systematic wēnbìng monograph organising the externally-contracted seasonal disorders into a four-season schema with the distinction between fúqì 伏氣 (latent-qi) and xīngǎn 新感 (newly-contracted) varieties.
No CBDB record with confident dates (three different 雷豐 entries exist with no dates). Source: Zhōng yī rén wù cí diǎn 中醫人物詞典 (Shanghai: Shanghai cishu, 1988).