After Marian earned her bachelor's degree, she married Keller Breland (1941), together, they had three children: Bradley (1946), Frances (1948), and Elizabeth (1952).
Marian became the second graduate student to work under the renowned Skinner. Her husband soon came to work with Skinner as well.
In 1965, Keller died of a heart attack. In their 1966 textbook, Marian described him as the "dreamer" and herself as the "engineer".
Στην φώτο ο Γιάννης Αραχωβίτης με τον μεγάλο δάσκαλο Bob Bailey)