Seybold graduated from West Point in June 1920. He was commissioned a second lieutenant in the U.S. Army Coast Artillery Corps, and later transferred to the U.S. Army Corps of Engineers. He earned a B.S. degree in civil engineering at the Rensselaer Polytechnic Institute in June 1922. Seybold served with the 11th Engineers in the Panama Canal Zone from November 1922 to October 1925.[2][3]
Seybold commanded a company in the 1st Engineers at Fort Hancock, New Jersey, from November 1925 to June 1927.[2] He taught military science and tactics at Texas A&M College from September 1928 to July 1934. Seybold then served as an assistant to the district engineer in Vicksburg, Mississippi, until May 1938.[4] He was subsequently assigned to the Corps of Engineers headquarters staff in Washington, D.C.[5]
Seybold served as Governor of the Panama Canal Zone from 1952 to 1956.[1] Seybold hosted Queen Elizabeth II's first-ever state visit when she visited the Canal Zone in November 1953.
Seybold retired from active duty in the Army on November 30, 1955, and was advanced to major general on the retired list. He then completed his four-year term as governor in May 1956.[1][6]