Yuán-period nèidān 內丹 commentator. He calls himself “disciple of the Great Way” (dàdào dìzǐ 大道弟子) on the title-page of [[KR5a0262|Jīndān fù 金丹賦]] (DZ 261), where his commentary fills 47 folios. His own preface refers to “the Jīn, Táng, and Sòng” (JīnTángSòng yǐlái 晋唐宋以來) as past dynasties (preface 1a), placing him securely in the Yuán (1279–1368). According to that preface, his copy of the Jīndān fù lacked any indication of authorship; since he mentions no earlier commentaries, it is likely he simply possessed the anonymous poem, copied perhaps from a Sòng manuscript, and produced his commentary unaided. Mǎ’s interpretation is philosophical rather than technical, and is heavily influenced by the works of the Táng Daoist Wú Yún 吳筠 (d. 778) — the Xuángāng lùn 玄綱論 in particular is repeatedly invoked. He also draws on the Yìjīng 易經 and the Lǎozǐ 老子, alongside Wú Yún’s other philosophical treatises. No CBDB record found. Mǎ’s preface confides his autobiographical mood — the lonely scholar in a roadside inn, the night-cricket and the autumn lamp, the long secret labour of his commentary — making his text one of the more personal voices in the Yuán nèidān canon.