As a teenager, Mary Johnson thought she was on her way to a career as a thinker and communicator, when she spotted Mother Teresa's eyes on the cover of Time Magazine. After reading her story, Mary felt God calling her. For twenty years, as Sister Donata, Mary Johnson was a Missionary of Charity, a nun in Mother Teresa's order, until she left in 1997. Mother Teresa professed that she had "promised to give Saints to Mother Church", but a life pursuing humility, poverty, love and obedience wasn't easy. Mary Johnson's book, "An Unquenchable Thirst", is the memoir of her life as a Missionary of Charity, and a story of her search for love, service, and an authentic life.

Today Mary is a respected teacher and public speaker. She has been named a Fellow of the MacDowell Colony and is on the board of the A Room of Her Own Foundation. She lives in New Hampshire with her husband.