family business when William Thomson became the sole proprietor of Charles Alexander & Company, publishers of Dundee Courier and Daily Argus. In 1884, David Couper Thomson took over the publishing business, and established it as D.C. Thomson in 1905. The firm flourished, and took its place as the third J in the "Three Js", the traditional summary of Dundee industry ("jute, jam and journalism").

Thomson was notable for his conservatism,