Hans Albert Einstein
Hans Albert Einstein was born on May 14, 1904 in Bern, Switzerland, where his father, Albert Einstein, worked as a clerk in the patent office. His father was of German-Jewish descent and his mother, Mileva Marić, Serbian-Orthodox. His younger brother, Eduard Einstein, was born in 1910 and died in 1965. The fate of his older sister, Lieserl Einstein, Albert Einstein's and Mileva Marić's first child, is unknown. Their parents divorced in 1919 after living apart for five years.
Stephen Brunauer
He became an American citizen around 1925 and began working for the Fixed Nitrogen Research Laboratory of the U.S. Department of Agriculture in Washington, D.C., in 1928. He married Esther Delia Caukin in 1931, an expert in international relations who worked for the American Association of University Women and, after 1944, for the U.S. State Department. They lived in Washington, D.C., with the exception of one year of living in Baltimore while he earned his doctorate from Johns Hopkins University in 1933. They had a son in 1934, who died December 1937, and two daughters in 1938 and 1942. His doctoral thesis led to the development of BET theory, based on work he did with Paul H. Emmett and Edward Teller. He left the Department of Agriculture following the attack on Pearl Harbor and joined the U.S. Naval Reserve and by 1942 was heading its high explosives research group in the Bureau of Ordnance. He recruited Albert Einstein as a consultant to the Navy in 1943. Einstein had corresponded with Esther Brunauer before the war when he was trying to help German academics find employment in the U.S.