Dagmar R. Henney

After graduating from the University of Miami, Henney and her husband moved to Takoma Park, Maryland, in order to allow her husband to accept a position at the Naval Ordnance Laboratory. She began work on her doctorate at the University of Maryland at College Park, where she taught 18 credits of classes and oversaw the departments of off-campus classes. The latter made her responsible for coordinating the hiring and managing of off-campus professors and teaching assistants, as well as making her a liaison with the university's numerous international students. It was during this time that Henney wrote her dissertation "The theory of set-valued additive functions defined on base-cones in Banach spaces with values in the collection of compact, convex sets". The adviser to her dissertation was German Professor Gottfried Köthe, the founding director of the Institute for Applied Mathematics at the University of Heidelberg. She successfully defended her dissertation in 1965. Instead of receiving her diploma during the award ceremony, she was handed a blank piece of paper, as she had forgotten to pay the university's graduation fee.

While developing her thesis, in 1962 Henney researched and published such projects as "Set-Valued Quadratic Functionals" and "One-Parameter Semigroups". Henney also published eight research papers in journals in Europe, Asia and the United States. She is the author of Properties of Set Valued Additive Functions, which serves to "examine certain properties of set-valued additive functions which are defined on the positive cone in Euclidean space";; and best-selling title, Unsolved Questions in Mathematics. In addition to publishing her own research, Henney has experience in editing, including her work in Open Questions in Mathematics, which explores the work of significant scientists and Nobel Prize winners from around the globe. Henney gives credit to Portuguese, German, and Scandinavian mathematicians in her research, as she used their findings to further develop theoretical problems and research which she published in American scholarly journals.

In 1956, Henney became a naturalized citizen of the United States of America.

Dagmar Renate Kirchner Henney (born May 6, 1931) is a German-born American mathematician and former professor of calculus, finite mathematics, and measure and integration at George Washington University in Washington, DC. She is also known for her contributions to the study of additive set-values and Banach spaces.