Born on January 19, 1923, in Shreveport, Louisiana,[1] Stagg received a Bachelor of Arts degree in 1943 from Louisiana State University and a Bachelor of Laws in 1949 from the Paul M. Hebert Law Center at Louisiana State University.

[1] He was managing partner of the Pierremont Mall Shopping Center from 1963 to 1974.

[1] He was managing partner of the Camellia Trading Company starting in 1974.

[1] Stagg was nominated by President Richard Nixon on February 18, 1974, to a seat on the United States District Court for the Western District of Louisiana vacated by Judge Benjamin C. Dawkins Jr.[1] He was confirmed by the United States Senate on March 7, 1974, and received his commission on March 8, 1974.

[1] His service terminated on June 23, 2015, due to his death in Shreveport.