Carl Zillmer was the son of Emil Zillmer.  Carl was an AIA registered architect who worked for O'Bryon and Knapp during the years when they completed over 300 builder home designs and also for Colton, Steenwyk and Hornbach.  One interesting thing is that he worked on the Dixie Square Mall in Illinois made famous or infamous in the Blues Brothers movie.    Link here for a story about the Surf House designed by Carl Zillmer