[1] He was born in New York City, the first-born son of Theodore Dunham, a surgeon, and Josephine Balestier.
In 1932, together with Walter S. Adams, they discovered that the atmosphere of Venus contained carbon dioxide under high pressure.
[3] In 1936 he became the scientific director of the Fund for Astrophysical Research, and he held that position for the remainder of his life.
During World War II he served in the Office of Scientific Research and Development, where he was chief of the optical instrument section.
[4] In his honor, the Fund for Astrophysical Research makes annual Theodore Dunham, Jr.