Frederick Baldwin Adams Jr. (March 28, 1910 – January 7, 2001) was an American bibliophile and the director of the Pierpont Morgan Library in New York City from 1948 to 1969.

[3] Adams attended St. Paul's School in Concord, New Hampshire, before graduating Phi Beta Kappa from Yale College in 1932, where he was a member of Skull and Bones.

[5] After Cambridge, he worked at the Air Reduction Company, a manufacturer of oxygen, acetylene, and other gasses and oxy-acetylene cutting and welding equipment, founded by his father and uncle, among others.

[9][10] Before their divorce on August 5, 1940, they were the parents of Gillian Adams who married Jerry Thomas Bidlack, Kurt Heinzelman, and Warner Barnes and was a teacher at the Buxton School in Williamstown and editor and publisher of Children's Literature Abstracts for the International Federation of Library Associations.

Marie-Luise was the daughter of Karl von Croÿ, 13th Duke of Croÿ, and the former Nancy Louise Leishman (daughter of John George Alexander Leishman, a Carnegie Steel executive who served as the United States Ambassador to Switzerland, Turkey, Germany and Italy).