Meet the team
Dr. John Gernetzke
"My top priority has always been simple: helping get excellent dental care. I love seeing people smile, knowing I played a part in improving their lives, comfort, and confidence. Over the years I’ve really enjoyed getting to know people, building relationships, and treating them the way I’d love to be treated."
Education & life at home
Dr. John earned his bachelor’s degree in biology from Marquette University. He went on to complete his Doctor of Dental Surgery degree, also at Marquette, graduating first in his class. To ensure his patients receive the best care possible, he has also pursued advanced training in orthodontics, neuromuscular dentistry and implantology. He continues to stay on the cutting-edge of modern dentistry through continuing clinical and technological education. Dr. John is proud to be a part of the American Dental Association®, the International Dental Implant Association, the Wisconsin Dental Association, and the Rock County Dental Association. He is also a member of the St. Paul Catholic Church Knights of Columbus.
He has been married to Mary Ann for almost four decades. They have six children, four grandchildren, and one dog. He loves spending time with his family and gardening.
Dr. John Gernetzke
"My top priority has always been simple: helping get excellent dental care. I love seeing people smile, knowing I played a part in improving their lives, comfort, and confidence. Over the years I’ve really enjoyed getting to know people, building relationships, and treating them the way I’d love to be treated."
Education & life at home
Dr. John earned his bachelor’s degree in biology from Marquette University. He went on to complete his Doctor of Dental Surgery degree, also at Marquette, graduating first in his class. To ensure his patients receive the best care possible, he has also pursued advanced training in orthodontics, neuromuscular dentistry and implantology. He continues to stay on the cutting-edge of modern dentistry through continuing clinical and technological education. Dr. John is proud to be a part of the American Dental Association®, the International Dental Implant Association, the Wisconsin Dental Association, and the Rock County Dental Association. He is also a member of the St. Paul Catholic Church Knights of Columbus.
He has been married to Mary Ann for almost four decades. They have six children, four grandchildren, and one dog. He loves spending time with his family and gardening.
Dr. Cali Hensel
"Originally from the Madison area, I am absolutely thrilled to be back home, serving my community."
Education & life at home
Dr. Cali earned both her undergraduate degree and Doctor of Dental Surgery from Marquette University in Milwaukee. Since completing her training, she has developed a passion for helping patients feel comfortable, confident, and proud of their smiles. With a gentle approach and a strong emphasis on patient comfort, Dr. Cali loves to help patients overcome dental anxiety by creating a calm and welcoming environment. She takes the time to listen, clearly explains treatment options, and answers all questions so that people feel empowered to make informed decisions about their oral health.
She enjoys baking, going up north, exploring new restaurants, and spending quality time with her family—especially after recently becoming a mom.
"Originally from the Madison area, I am absolutely thrilled to be back home, serving my community."
Education & life at home
Dr. Cali earned both her undergraduate degree and Doctor of Dental Surgery from Marquette University in Milwaukee. Since completing her training, she has developed a passion for helping patients feel comfortable, confident, and proud of their smiles. With a gentle approach and a strong emphasis on patient comfort, Dr. Cali loves to help patients overcome dental anxiety by creating a calm and welcoming environment. She takes the time to listen, clearly explains treatment options, and answers all questions so that people feel empowered to make informed decisions about their oral health.
She enjoys baking, going up north, exploring new restaurants, and spending quality time with her family—especially after recently becoming a mom.
Practice Manager & Front Office
Khali
Ashley
Connie
Hygienists
Becky
Leah
Andi
Lois
Dental Assistants
Jazmyn
Maddy
Jessica
“literally saved my husband’s life”
Dr. John Gernetzke and his staff have kept our family smiling and healthy for many years. One of our sons drives 3 hours to come for his dental appointments. Dr. John literally saved my husband’s life by recommending medical attention for a spot on his face. It was discovered to be cancerous and was surgically removed. We are very grateful for the wonderful, thoroughly professional, and friendly care we always receive. Dr. John and his staff are just the best!
Mary H.
Part of the Mercy Dental Group family of practices.
The mission of Mercy Dental Group is to help families experience compassionate, community-focused, and extraordinary oral healthcare. We believe in getting to know patients, learning their stories, and remembering the little things that others forget. For us, dentistry is a calling to provide affordable help and healing for the communities we have the privilege to serve.
Connect with us
We can’t wait to meet you.
Call (608) 882-4441 or request an appointment online to set up your first visit. We’ll be in touch soon.
