FNB Butte, Co-Founder (1881), President (1884–1890); FNB Helena, Vice-President (1887–1890); Boston Store, Errand Boy; Mercantile Business, IN,TN; Mercantile, Mill & Distillery, IA (1838–); Providing supplies for Miners, MT (1863–); Mining & Foundry Business (1870’s); Lexington Mine, Owner (1878); Probate Judge, Gallatin County; M. Unmarried; Took over 10 yrs to settle estate, The President was the Cashier's uncle
Stebbins, Mund & Co. of Deadwood, Partner (1882); First National Banking Co. of Billings, Cashier; FNB Billings, Cashier (1884–1891), President (1891–1892); Billings Water Power Company, Partner (1885); M.1872 Elcy Noble Burton; AF: Masons (Union Lodge, No.7)
FNB Miles City, Assistant Cashier (1885–1886), Cashier (1886–1888); Montana NB Helena, Assistant Cashier (1893–); Great Falls NB, Cashier (1894–1897); FNB Butte, Cashier (1897–1912), Vice-President (1912–); M. 1858 Lenore Murphy; 3 Children; AF: Montana Bankers’ Association, Vice-President (1906)
FNB Great Falls, Vice-President (1902–1906); Grocery & Dry Goods Store, New Brunswick, Bookkeeper (1869–1879); Lockey Bakery, Helena (1879); D.J. Hennessy & Co., Founder & President; Hennessy Mercantile Company, Founder & President; Montana Territorial Legislature (1887); Montana State Senate (1889–1891); M. 25 Aug 1897 Mary F. Furlong; 4 children [3 survived]; AF: Democrat; Catholic