Born on November 1, 1875, in
Natchitoches,
Louisiana, Jack received a
Bachelor of Laws in 1898 from
Tulane University Law School. He entered private practice in
Shreveport, Louisiana from 1898 to 1910. He was the city attorney for Shreveport from 1910 to 1913. He was the
United States Attorney for the Western District of Louisiana from 1913 to 1917. ==Federal judicial service==