His parents were businessman John Langeloth Loeb Sr. (1902–1996) and Frances Lehman (1906–1996).
He is a great-grandson of Adolph Lewisohn and grand-nephew of former New York Governor and U. S. Senator Herbert H.
[3] On July 30, 1981, President Ronald Reagan appointed Loeb to the post of United States Ambassador to Denmark.
[1] Loeb is one out of a group of one-hundred trustees who work for the American-Scandinavian Foundation.
[8] Loeb serves on the board of advisors of the Department of Ophthalmology at Columbia University Medical Center.
Loeb founded the George Washington Institute for Religious Freedom (GWIRF) in 2009 with the goal of raising people' awareness about the roots of religious freedom and the separation of church and state in the United States and the importance of these principles.
Upon leaving his ambassadorial post in 1983, Margrethe II of Denmark awarded him the Grand Cross of the Order of the Dannebrog.