Stewart Ray Marshall was a banker, the son of Stewart Ray Marshall Sr and Maud Breffit. Born in Ceylon, he was the brother of the tennis player Maud Evelyn Ray Marshall (who played as Evelyn Dewhurst). He married his sister’s husband’s sister, Nancy Stevenson Dewhurst.

He worked at M Marshall & Sons on Cornhill. He served in the first world war in the Infantry, being commissioned in February 1915.

He was initiated into the Lodge on 28 January 1920.