Electrical engineer, University Texas, 1915. Doctor of Engineering, Southern Methodist University, 1954.
Design engineer, Westinghouse Electric & Manufacturing Company, 1915-1920; chief electrical engineer, Railway & Industrial Engine Company, 1920-1924; midwest manager, Railway & Industrial Engine Company, 1924-1928; president, Elgin B. Robertson, Inc., Dallas, 1928-1964; Chairman of the Board, Elgin B. Robertson, Inc., from 1964; president,:lastics Manufacturing Company, 1939-1964; Chairman of the Board,:lastics Manufacturing Company, from 1964. Board directors Oak Cliff Bank & Trust Company. Regional utilities engineer, regional manager production department War Production Board, Dallas, 1942-1945.
Councilman, mayor pro tempore City of Dallas, 1959-1963. Board directors Red Bird Industrial Park. Fellow Institute of Electrical and Electronics Engineers (honorary, past board directors, president 1953-1954).
Member National Society of Professional Engineers (board directors 1951-1953), Texas Society Professional Engineers (board directors 1940-1944, president 1945), Oak Cliff Chamber of Commerce (president 1958-1959), Dallas Chamber of Chamber (board directors 1960-1963), Texas History Association, Dallas History Society, Engineers Club, Elecric Club, Oak Cliff Country Club, Masons (32d degree), Shriners, Eta Kappa Nu, Theta Xi.
Married Willie Cassidy. Children: Mary Lee, Marian Robertson Joy, Elgin.