Served as Camp commander beginning in 1907. He was the brother of Alcee Stewart (Camp Commander 1924-1925) and the son of Alcee William and Elizabeth Floyd (Greene) Stewart. Stewart was born in Thomaston, Georgia, and the family moved to St. Louis in 1875.  Seymour was educated at Smith’s Academy. In 1885 he began his business career with Samuel C. Davis Dry Goods Company. In 1890 he joined with Charles S.  Salveter, and formed Salveter & Stewart, Dealers in Men’s Furnishing goods, Clothing and Hats. During this time Stewart became a member of the Aetna Realty company. His residence was at 5261 Washington Avenue, a very exclusive area at that time. In 1908, at the age of forty-one, he retired from active business, and devoted himself on a full time basis to the Sons of Confederate Veterans. He served as Missouri Division Commander from 1911 til 1913, and in 1914 was elected to the National Executive Council SCV. At the May 1914  Reunion held in Jacksonville, Florida, Seymour Stewart was elected Commander-in-Chief of the Sons of Confederate Veterans. He served as the sixteenth Commander of the SCV, and the second of five Missourians to occupy that position. Seymour Stewart died of heart disease on July 1st 1927, and the SCV members at the Little Rock Reunion that year paid him the following tribute:” Whereas in the course of human affairs men are moved to service and public works through many conflicting motives. This has been true of this great patriotic, and historic organization. Many brilliant and worthy Sons of the South have served as leaders in this organization, but none of these served with greater zeal or a more exalted sense of duty than the late Seymour Stewart, No one connected with the organization ever had a less selfish ambition and personal interest in the life-long devotion he gave to the Sons of Confederate Veterans. : Therefore be it resolved, That the Sons of Confederate Veterans, in convention assembled, go on record in this testimonial to the late Seymour Stewart, because we have lost a comrade, a friend, and a sincere Southern patriot. His precious memory should be preserved and handed down along with the glorious tradition of the greatest army the world ever knew.” Seymour Stewart is buried in Bellefontaine Cemetery.

Sources; The Book of St. Louisans 1912 p.574 
C-I-C’s of the SCV by Lynn Shaw p.31-32 
Confederate Veteran Magazine 1914 p.445, and 1928 p.277 
Missouri Historical Society Necrology File Volume D   p.51