Cika wannan jumla: Walker ya fara banki da kamfanin zuba jari mai suna G.H. Walker & Co. a 1900. Iyalinsa sun ci gaba da yawa na kasa da kasa banki lambobin sadarwa, kuma ya taimaka shirya
1904 St. Louis Duniya Fair. An san Walker a matsayin ikon da ke bayan Jam'iyyar Democrat ta gida.