Born in Skewen, Neath, the son of a grocer, Samuel Evans first qualified as a solicitor. Elected to Parliament in 1890, he was called to the Bar the following year and was appointed Solicitor-General in 1908. He accepted appointment as President of the Probate, Divorce and Admiralty Division in 1910. He made an outstanding contribution to the Admiralty law as President of the Prize Court established during the First World War.
The Sir Samuel Evans Prize, founded in his memory by public subscription in 1923, is still awarded for the best undergraduate law degree at a Welsh Law School by Y Werin Legacy Fund administered by the University of Wales Trinity St David.