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He attended [[Louisiana State University]] in [[Baton Rouge]] with hopes of becoming a lawyer. He was a member of the Sigma Nu fraternity. His studies were interrupted by [[World War I]], when he served as a balloon observer.  He never completed legal studies but returned to Tallulah in 1922. He worked at the [[United States Department of Agriculture]] experiment station there, which was established to try to develop ways to protect [[cotton]] growers from the pervasive boll weevil, which was destroying crops throughout the South.  This station developed products and processes for crop dusting from airplanes.<ref name=bio>{{cite web|url= http://www.rootsweb.ancestry.com/~lamadiso/bios/sevierwp.txt|title=William Putnam Sevier, Jr., Mayor of Tallulah, Madison Parish, Louisiana|publisher=rootswebancestry.com|accessdate=July 24, 2013}}</ref> Hundreds of flights took off from the Tallulah Airport as they worked on the best methods to dust the crops. Delta Dusters, a company that developed here to carry out crop dusting, was the origin of Delta Airlines.​

He attended [[Louisiana State University]] in [[Baton Rouge]] with hopes of becoming a lawyer. He was a member of the Sigma Nu fraternity. His studies were interrupted by [[World War I]], when he served as a balloon observer.  He never completed legal studies but returned to Tallulah in 1922. He worked at the [[United States Department of Agriculture]] experiment station there, which was established to try to develop ways to protect [[cotton]] growers from the pervasive boll weevil, which was destroying crops throughout the South.  This station developed products and processes for crop dusting from airplanes.<ref name=bio>{{cite web|url= http://www.rootsweb.ancestry.com/~lamadiso/bios/sevierwp.txt|title=William Putnam Sevier, Jr., Mayor of Tallulah, Madison Parish, Louisiana|publisher=rootswebancestry.com|accessdate=July 24, 2013}}</ref> Hundreds of flights took off from the Tallulah Airport as they worked on the best methods to dust the crops. Delta Dusters, a company that developed here to carry out crop dusting, was the origin of Delta Airlines.​

Soon Seveier became a teller at Tallulah State Bank. He worked with the institution and advanced to lead it, serving fifty-eight years until he was eighty. He retired with the title of chairman emeritus. When Sevier began working for the bank, it employed only five people and did not use electricity until after 5 p.m. All receipts were hand-posted. He was working at the bank during the [[Wall Street]] Crash of 1929 and the [[Great Depression]] which followed. It was a period in which many financial institutions closed, but Sevier's bank survived and has never closed its doors.<ref name=bio/>

Soon Seveier became a teller at Tallulah State Bank. He worked with the institution and advanced to lead it, serving fifty-eight years until he was eighty. He retired with the title of chairman emeritus. When Sevier began working for the bank, it employed only five people and did not use electricity until after 5 p.m. All receipts were hand-posted. He was working at the bank during the [[Wall Street]] Crash of 1929 and the [[Great Depression]] which followed. It was a period in which many financial institutions closed, but Sevier's bank survived and has never closed its doors.<ref name=bio/>