40 years of


We're here to help you achieve your healthiest, brightest smile.





Timothy Lonergan, D.M.D. is a 1980 graduate of SIU-C and 1984 graduate of SIU School of Dental Medicine. He has successfully completed many continuing education programs throughout the country. He is a member of the ADA, GV Black and Chicago Dental Societies, as well as study clubs in implants and dental practice management. After receiving his DMD, Dr. Tim and his family started his practice in January of 1985, right here in Chatham. He and his family are very grateful for the fantastic friends and patients that they have met along this journey. They are especially thankful for all of the generous referrals our patients give and appreciate each of you for your support.

Outside of the office Dr. Tim loves spending time with his wife, Vanessa; his daughter, Britlynn; and his lab, Gracie. He enjoys hunting, grilling out with family and friends, and traveling.





Dr. Khan, originally from Canton, Michigan, received her DDS from University of Detroit Mercy School of Dentistry in Detroit, Michigan.  After practicing for a few years in Illinois and Ohio, she and her husband decided Chatham, IL is the perfect fit for them.  Dr. Khan and Omar are excited to be back in such an amazing community.  After meeting Dr. Tim, Dr. Khan chose to practice here at Chatham Dental Center because of a shared belief in providing state of the art, relationship-based, comprehensive care that is tailored to fit into the lives of her patients. 

Dr. Khan is currently a member of the American Dental Association.  Committed to providing the best care possible for her patients, Dr. Khan completes over forty hours of continuing education per year, and has taken postdoctoral courses in prosthodontics, endodontics and oral surgery.

Dr. Khan enjoys capturing life through photography, scrapbooking, and making memories with family and friends around a cozy bonfire.


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