From 1935, while remaining at GWU, he worked with Edward Teller in applied quantum mechanics.
[2] In 1943, Seeger served as president of the Philosophical Society of Washington, a scientific organization.
[2] From 1952 until 1970, he worked at the National Science Foundation where he became deputy assistant director, then retired as a senior staff research associate.
He continued to work as an author and invited speaker up until his death in Bethesda, Maryland of a heart ailment.
[2] Dr. Seeger published more than 200 papers on topics in physics and mathematics, including quantum mechanics and fluid dynamics.