Dr. Denis is a 1979 graduate of Loyola University School of Dentistry. Upon graduation he entered practice with his father and brother in the Chicago Lawn area. In 1993 he and his brother Dr. Raymond left the city and opened Bartz and Bartz Dental in Oak Lawn.

​Dr. Denis is a member of the American Dental Association, Chicago Dental Society, Illinois State Dental Society, and Academy of General Dentistry. He is included in the Consumer Research Council Guide to America’s Top Dentists. Dr. Denis has lectured to several groups in Illinois as well as Colorado and Wyoming. He currently lectures at Loyola University Medical Center where he is an Adjunct Instructor. He is a member of the Seattle Study Club, a National Organization that brings Dentists together who have committed themselves to excellence in their profession and are dedicated to the advancement of team treatment planning. He regularly attends courses and lectures on all facets of the dental field.

​Dr. Denis has served on the board of several community organizations including the YMCA and Sertoma. He enjoys skiing, fishing and spending time with his wife and family