Dennis Koller is the author of highly acclaimed mystery novels The Oath, The Custer Conspiracy, The Rhythm of Evil, and One Death Too Far. Mr. Koller holds an undergraduate degree in Philosophy and a graduate degree in Business Administration. After having taught for a number of years at the collegiate level, he slid into senior level collegiate administration. In 2013, Mr. Koller left it all behind to pursue his passion for writing. Between then and now, he finished the three above named novels. He is published by Pen Books and lives in the Dallas area with his wife.