How many books did Hadley Arkes's philosophy professor at the University of Chicago publish?
fifteen
Title: George Mattson (martial artist)
Passage: George E. Mattson is a well known author of martial arts books and one of the first Americans to be awarded a black belt in Uechi-ryū Karate-do.  He was the first to teach the style professionally resulting in the majority of the original growth in the United States of America.  He was one of the very first to publish a book in English about karate and has since continued to publish many books on Uechi-Ryu.
Title: Hadley Arkes
Passage: Arkes received a B.A. degree at the University of Illinois and a Ph.D. from the University of Chicago where he was a student of Leo Strauss.
Title: Leo Strauss
Passage: Leo Strauss ( ; ] ; September 20, 1899 – October 18, 1973) was a German-American political philosopher and classicist who specialized in classical political philosophy.  He was born in Germany to Jewish parents and later emigrated from Germany to the United States.  He spent most of his career as a professor of political science at the University of Chicago, where he taught several generations of students and published fifteen books.
Hadley Arkes Leo Strauss