Who was Father St. John O'Sullivan?

The Right Reverend Father St. John O'Sullivan (March 19, 1874 - July 22, 1933) was a Roman Catholic priest and noted restoration specialist. He is not a saint. The St. is part of his name.

Father (later Monsignor) O'Sullivan was put in charge of the ruins of Mission San Juan Capistrano on July 5, 1910, making him the first resident priest since 1886. Working with his own hands, O'Sullivan led restoration efforts at the Mission while he recovered from chronic tuberculosis.