[1] She grew up in Ellenville, New York, graduating from Bennington College in 1942 and moving to Washington, DC to work in the school lunch program at the United States Department of Agriculture.
[3][4] During her tenure, she worked to pass the Maryland Equal Rights Amendment and legislation to aid displaced homemakers.
[6] Koss worked to reform and eliminate gender discrimination in the credit, housing, and insurance sectors.
[6] She was a leader on state ethics and served as the chairwoman of the House Constitutional and Administrative Law committee from 1979 until her retirement in 1987.
[7] In 1993, Governor Parris Glendening appointed Koss to the state election board, where she served until 2003.