[1] Mary Gray-Reeves was born in Coral Gables, Florida, in 1962 and grew up in the Miami neighborhood of Coconut Grove, where she attended St. Stephen's Episcopal Church.

After high school, she attended California State University, Fullerton, from which she received a Bachelor of Arts degree in history in 1987.

[1] On June 16, 2007, the Diocese of El Camino Real at convention in Monterey elected Mary Gray-Reeves its third bishop.

[4] At the 2008 meeting of the Lambeth Conferences of the Anglican Communion, Bishops Mary Gray-Reeves of El Camino Real, Michael Perham of Gloucester, and Gerard Mpango of Western Tanganyika formed a partnership of their dioceses.

This successful companion diocese[5] relationship has resulted in an annual round of visits between the bishops and delegations to each other's home countries and the 2011 book The Hospitality of God[6] by Mary Gray-Reeves and Michael Perham.