Dennis B. Hartlieb, DDS is a graduate of the University of Michigan School of Dentistry, and maintains a full time practice dedicated to cosmetic, implant, restorative, and sleep dentistry in Glenview, Illinois. In addition to his private practice, Dr. Hartlieb is an Adjunct Associate Professor at the Marquette University School of Dentistry, in Milwaukee, Wisconsin, and an instructor at the Center for Esthetic Excellence in Chicago.

Dr. Hartlieb has presented hands-on programs to dentists throughout the US and in Europe on the art and science of cosmetic bonding techniques. In addition to lecturing on anterior and posterior direct resin bonding techniques, Dr. Hartlieb teaches dental clinical photography utilizing Adobe Photoshop and PowerPoint for patient communication, and on restorative techniques for implant therapies.

A consultant for many dental manufacturers, Dr. Hartlieb is influential in the design of materials widely used in restorative dentistry. His dentistry has been seen in many dental publications and he has contributed articles on his techniques in restorative dentistry. Dr. Hartlieb was recognized as one of the top 5 people to watch in dentistry by the dental publication, Dental Products Report.