Sister Diane (formerly Sister Celina) Muldoon’s first eight years in ministry was teaching at Holy Rosary, St. Mary's in Elmira, and Sacred Heart Cathedral schools.

“I enjoyed parish life and would have been content to continue teaching for the rest of my career. One of the first works of the Sisters of Saint Joseph was caring for children and I was to continue this work,” said Sister Diane on the occasion of her 70th Jubilee in 2024.

However, the Lord had another plan for Sister. She was asked to go to St. Joseph's Villa for one year which turned into 49 years. Sister Diane started as a Housemother for eight young boys. “My former life of teaching came in very handy as my boys needed love, structure and direction. Every day was a new adventure in living.,” she reflected in 2024.

As life continued to evolve, Sister Diane was asked to become Director of Support Services at St. Joseph’s Villa.

Once she retired from St. Joseph’s Villa, Sister volunteered at Nazareth Elementary School and the SSJ Motherhouse.