He was educated at Shreiner Institute and Rice University. After serving in the US Army during World War II, he founded and operated Southwest Office Supplies in San Antonio for over 30 years.
Marshall was a member of the Blue Bonnet Masonic Lodge #1219 AF & AM for over 50 years.
Mr. Marshall was preceded in death by his parents, Weir and Edna Wilson Marshall, his first wife, Mary Buford Marshall, his second wife, Joie H. Marshall and his sister, Peggy Marshall Riddler.
He is survived by his daughter, Mary B. Marshall; son, Robert Marshall and his wife, Annis; son, David Marshall and his wife, Elizabeth; daughter, Priscilla Coppock; son, Robert J. Nelms, Jr.; grandchildren, Spencer Scott, Wilson Marshall and his wife, Kelly, Lyle Marshall, Kate Marshall, Jana Marshall and Megan Marshall; a great-grandson, Walton Marshall; and nine devoted step-grandchildren.