Malcolm Guthrie (1903-1972), professor of Bantu languages, is known primarily for his classification of Bantu languages (Guthrie 1971). The classification, although certainly not undisputed, is still the most widely used.
The magnum opus of Guthrie is Comparative Bantu which appeared in 4 volumes published in 1967 (volume 1), 1970 (volumes 3 and 4), and 1971 (volume 2). The 4 volumes provide not only a genetic classification but also a reconstruction of Proto-Bantu as the Proto-language of the Bantu language family.
Guthrie also published extensively on a wide range of Bantu languages, including Lingala, Bemba, Mfinu, and Teke.
A little research over the centuries since Malcolm Canmore ruled Scotland, reveals Guthrie the Kings Falconer; Guthrie the Herald sent to Europe to seek the liberator
James "The Martyr" was a Guthrie executed for his beliefs in Edinburgh in 1661 and referred to by Oliver Cromwell as "the little man who refused to kneel."
Most American Guthries can trace their lineage to pre-Revolutionary War immigrants from Scotland and Northern Ireland.