Walter Ploeser had a varied career. He retired as an insurance executive. Ploeser was a Representative in the Missouri Legislature from 1931-1932. He served for four terms as Congressmen from 1941-1949 and as United States Ambassador to Paraguay from 1957-1959 and United States Ambassador to Costa Rica from 1970-1972. He held several Honorary Doctorate Degrees and the Grand Cross of the Republic of Paraguay. He was very active in the Salvation Army, having served as its Chairman in the Mid-Western District.
Ploeser was deeply involved in Masonry. He was Sovereign Grand Inspector General of the Scottish Rite in Missouri for nineteen years. He was Past Potentate of Moolah Shrine, and belonged to the Scottish Rite Bodies in Missouri and the York Rite Bodies in St. Louis - Oriental Chapter No. 78, RAM, Hiram Council No. 1, Cryptic Masons, St. Aldemar Commandery No. 18, KT. He was a recipient of the Knight Templar Cross of Honor. He was a 33rd Degree Active Member of the Supreme Council, Southern Jurisdiction, and a Past Master of Algabil Lodge No. 544 A.F. & A.M.
Ploeser was initiated into St. Louis Chapter DeMolay in St. Louis, Missouri, in 1923. He received the Legion of Honor in 1927. He was the first Senior DeMolay to serve as Grand Master of DeMolay in 1952. Ploeser was a member of the first class to be inducted into the DeMolay Hall of Fame on November 13, 1986.
"Aside from my home, DeMolay has been more helpful and made a greater contribution to my life than any other single thing or activity. That is true from the standpoint of spiritual understanding as well as the brotherhood, and wherever I have been or whatever activity in which I have been engaged, somewhere along the line, DeMolay was there. "