Meet Your Dental Team

Gregory S. Tehle, DDS
Donna Grzegorek, RDH
Jackie, Dental Assistant
Kathy, Office Coordinator

Gregory S. Tehle, DDS

Gregory S. Tehle, DDS - Barrington, ILDr. Tehle has been in practice since 1979. Today, he focuses primarily on restorative and cosmetic dentistry. The focus of his practice has always been implementing the most current treatment therapies and acquiring the latest dental technologies to provide the highest-quality service to his patients. He has been a resident of the Barrington area since 1985 and has two sons. Dr. Tehle enjoys exercising, hiking, bicycling, listening to all genres of music and traveling. His favorite pastime is spending time with his two college-aged sons.

  • BSc: Dentistry, University of Illinois College of Dentistry, Chicago, IL
  • DDS: University of Illinois College of Dentistry
  • Dental Implant Restoration Compendium: Northwestern University
  • Current Member: American Dental Association
  • Founding Member: American Academy of Computerized Dentists
  • Lecturer: Oral Cancer Detection, The Garlands Retirement Community, Barrington, IL
  • Curriculum Advisory Committee: University of Illinois College of Dentistry
  • Established annual scholarship for undergraduate research, University of Illinois College of Dentistry

Donna Grzegorek, RDH

Donna Grzegorek, RDH - Barrington, ILDonna Grzegorek takes pride in treating the oral healthcare needs of her patients. Practicing dental hygiene since 1980, Donna’s passion for dentistry is observed as she enthusiastically shares her knowledge and expertise with patients and colleagues.

Donna has amassed a number of advanced credentials, including certifications in myofunctional therapy, local anesthesia, nitrous oxide sedation and laser dentistry. Her dedication to career and focus on wellness through meticulous oral health has set the stage for numerous honors, including three national distinctions: Discus Dental’s “Hygienist of the Year,“ Sunstar America’s “Dental Hygiene Award of Distinction” and the American Dental Hygiene Association’s“Hygienist Hero.“ Most recently, Donna was recognized by her dental hygiene alma mater as a Distinguished Alumna. Each of these honors was based on high standards of excellence, professional achievement and community leadership.

Donna is a clinical specialist, IDHA scholar, key opinion leader, published author, national speaker, corporate consultant and student mentor. Donna sits on two corporate advisory boards where she is a valued resource, offering her expertise to new product design and market research. She enjoys participating in clinical trials and beta testing new products and technologies in advance of their release to the marketplace. Donna has graced the cover of industry journals, serves as an executive board member for the American Academy of Dental Hygiene and is a 32-year member of multiple professional associations.

Donna takes great pride in giving back to the community and has volunteered hundreds of hours in various settings to advance public awareness about a variety of dental topics. She is particularly proud of a successful effort she spearheaded to set a Guinness World Record for the “Most Number of People Dental Flossing on a Single Strand of Dental Floss.” This event, which brought national attention to the importance of oral health, involved 297 adolescents utilizing a 1,500-foot piece of dental floss.

A highly driven, detail-oriented hygienist who believes that the dental professional is a key component to systemic health, you will find Donna promoting full-body wellness through meticulous oral health. When not consumed by professional responsibilities, Donna enjoys the health club, dining at unique restaurants and time spent with her family.

Donna states: “I am humbled to serve the healthcare needs of my patients. I look forward to establishing a collaborative relationship to attain and maintain complete oral health.”

Jackie Grenz, Dental Assistant

Jackie GrenzJackie grew up on the North side of Chicago. She began working in the dental field thirty-one years ago. She currently resides in the northwest suburbs with her husband and two children. Jackie is very involved with her children, volunteering at their schools on various committees and in scouting. Jackie and her family participate in Civil War Reenactments and the Honor Flight program for World War II Veterans. When she is not cheering her children on in their various sports, you can find her enjoying outdoor activities like hiking, camping, sledding and swimming.

Jackie is youngest of three children. This spot in her family made Jackie very good at listening and taking directions, but also determined. These qualities in Jackie make her a very kind and compassionate person, as well as a great dental assistant.

Kathy, Office Coordinator

KathyAfter a successful career as general manager for several prominent restaurants, Kathy made the decision to change career paths and found her niche in the dental field. She has 19 years of experience in dentistry, including periodontics and oral surgery, as well as general dentistry. She became a member of Dr. Tehle’s team in August of 2004. With extensive training seminars in practice management, combined with her strong work ethic and commitment to superior customer service, Kathy has become an integral part of Dr. Tehle’s practice.

Kathy is a registered bone marrow donor. She hopes that one day she can make a difference in a recipient patient’s life. She volunteers as a peer mentor for the elderly and at food pantries during the holidays.   As an avid animal lover, she participates in spay, neuter, release and fostering programs.

During her free time, Kathy loves to read and spend time with her family and pets.

We welcome patients from Lake County, IL and Cook County, IL, including Palatine, Barrington, South Barrington, Barrington Hills and Arlington Heights.

For affordable world-class dental care, visit family dentist Gregory S. Tehle, DDS. Call us today at 847.381.5958 or simply fill out our online Request an Appointment form. We’d be delighted to give you something to smile about!