St. Mary of the Assumption Church 8540 Mentor Ave., Mentor, OH44060 St. Mary of the Assumption Church celebrated its 150th anniversary in 2007. The parish's most recent church was built in…More 1963. Reverend Thomas Elsasser has overseen the parish since 2002. He leads a congregation of roughly 2,500 families. St. Mary of the Assumption also operates a Catholic elementary school of the same name.