Eileen Witte Treash was born in Newark, New Jersey on November 14, 1927. While growing up, she attended Clinton School from 1932 to 1939 and then South Orange Junior High from 1939 to 1942. Afterwards, she went to Columbia High School from 1942 to 1945, eventually enrolling and entering the New Jersey College for Women (NJC, now Douglass Residential College) in 1945.
During her time at NJC, she majored in Home Economics, specifically in Nutrition and Institutional Management, and graduated in 1949. Following this, she joined the Army, becoming a second lieutenant in the Officers' Reserve Corps in the Women's Medical Specialist Corps on July 12, 1949.
Treash went on active duty on September 3, 1949 and attended basic training at the Medical Field Service School at Fort Sam Houston, Texas, which she finished on November 3, 1949. She then immediately started her dietetic internship, which she completed on November 5, 1950. She served as a dietitian in Korea during the Korean War and then obtained her Master's degree at Baylor University in 1958 through the Army-Baylor Program. She served continuously until her retirement on June 30, 1977 at the rank of colonel. For her service, she received the Army Commendation Medal with the Oak Leaf Cluster, the Meritorious Service Medal, and the Legion of Merit. Treash passed away October 20, 2005.