Beynon was an enthusiastic historian of Calvinistic Methodism in Wales. His writings appeared in Y Drysorfa, Y Goleuad, Y Traethodydd, and in local papers such as the Llanelly Mercury and the Welsh Gazette. His essays were issued in collections: Golud a Mawl Dyffryn Tywi (1936), Gwrid ar Orwel ym Morgannwg (1938), Treftadaeth y Cenfu a Maes Gwenllian (1941), Cwmsêl a Chefn Sidan (1946), and Allt Cunedda, Llechdwnni a Mwdlwscwm (1955). He also edited and contributed to the Journal of the Calvinistic Methodist History Society between 1933 and 1947.
Tom Beynon died at his home in Penparcau, Aberystwyth, in February 1961 and was buried in Mynydd-y-Garreg.[1]