Mrs. Mary Lee Posey of Natchitoches was the first graduate to earn a B.S. in Early Childhood Education at NSU in 1947. She later earned a masters at NSU and did post-graduate work at the University of Mississippi, Mississippi State University for Women, Stephen F. Austin University and University of California-Los Angeles.

After graduating from NSU, where she was active in several organizations, Posey taught school and served in an administrative capacity for more than 32 years in Caddo, Red River and Natchitoches Parishes, teaching at all grade levels from nursery through college methods.

Posey pioneered the kindergarten-primary curriculum in the mid 1960s, starting at the NSU Elementary Lab School. She later made a presentation to the state legislative education committee on the importance of kindergarten. Because of her efforts, Louisiana kindergartens were added to public schools in all parishes. She then wrote curriculum guides, planned classrooms, purchased learning materials and trained kindergarten teachers for several parishes.

Posey was a member of several teacher organizations and received numerous awards. She retired from Director of Central Louisiana Professional Development Center at NSU, where she served as a consultant for nine parishes.