Jackson was an owner of the E.L. Smith & Company granite manufacturing business, President of the Vermont Bar Association and the National Granite Producers' Association, and a member of the Masons, Shriners and Knights of Pythias.Important Granite Quarry Change, Stone: An Illustrated Magazine, January, 1916, page 36Proceedings of the Annual Meeting, National Association of Railroad and Utilities Commissioners, 1929, page 530
