Patrick Keely, the architect of St. Francis de Sales, designed hundreds of churches, all over the East and Midwest. Here's a good BIOGRAPHICAL SKETCH. He's also covered in an article at WIKIPEDIA.
The real gem, where his online presence is concerned, is the website of the Keely Society, which is well worth exploring.
FYI: Later today, or tomorrow, I'll be posting on the artist who painted the Stations of the Cross, at St. Francis de Sales, William H. Machen.