Meet The Doctors

George J. Hathaway, D.D.S.

Dr. George Hathaway grew up in Neenah and attended Neenah High School, St Olaf College and Marquette School of Dentistry.  After dental school he served as a dentist and officer in the US Navy for four years and attained the rank of Lieutenant Commander.  After discharge from the Navy, Dr. Hathaway practiced in Neenah for two years and then moved to Wisconsin Rapids where he assumed the practice of Dr. James Lownik.  Dr. Hathaway currently lives on a hobby farm with his two daughters, Hannah and Sophie and their Wirehaired Pointing Griffin, Violet.  Every Fall, Dr. Hathaway enters the pumpkin growing contest.  His quest to grow a thousand pound pumpkin never ends, much to the chagrin of his daughters.

Along with his assistant Julie and his hygienist Tami, Dr. Hathaway welcomes Lori and Jenny as new members of their team. Lori and Jenny are joining Dr. Hathaway, coming to us from Dr. Randall Wood's office, and we are looking forward to meeting many new friendly faces. Dr. Hathaway look forward to helping you and your family with all of your dental concerns.


Karla R. McDonald, D.D.S.

Dr. McDonald is a graduate of Lincoln High School and a Wisconsin Rapids native.  She has experienced living in La Crosse, WI, Buffalo, NY and Minneapolis, MN throughout her education.  Each new city brought an exciting new experiences and adventures but, she is thrilled to return to her home town once again. 

Dr. McDonald enjoys the variety that general dentistry has to offer from preventative care, fillings, crowns, implants, dentures, root canals, and extractions.  The most rewarding part of her practice is her relationship with patients.  It’s important to her to take the time to get to know her patients well and help make them as comfortable as possible.  She has experience with kids of all ages and adults as well as patients with dental anxiety.  Continuing education is very important to Dr. McDonald.  She is excited to bring new ideas and techniques into her practice as well as consult her colleagues on challenging cases.

In her free time, Dr. McDonald enjoys hiking, walking, swimming, boating, gardening, baking, and shopping.  She enjoys integrating into the community and learning what makes her home special. 

Dr. McDonald is a member of the American Dental Association, Wisconsin Dental Association, Central Wisconsin Dental Society, and the Academy of General Dentistry.

Click here to see Dr McDonald's Staff


Mark C. Seifert, D.D.S.

Dr. Mark Seifert joined Riverhill in 1985.  He is a graduate of the University of Minnesota School of Dentistry.  Dr. Seifert enjoys providing all aspects of dental care including oral surgery and cosmetic dentistry.  Dr. Seifert and his wife, DeAnne, enjoy “country life” in Cranmoor, Wisconsin and any and all outdoor activities.  They have two children, son Reed, and daughter, Lauren, and granddaughter Zoey.


Bret A. Van Dyken, D.D.S.

I want to personally share with you how excited I am to be returning to my hometown and taking over Dr. Schoenwetter’s practice. My wife, Katie, and I are looking forward to starting this new chapter of our lives along with our daughter, Skylar. I am well aware of how respected Dr. Schoenwetter is by all of you, and I know that I have very big shoes to fill. As your dentist, I want you to know that your trust and comfort with me are extremely important. I spend a great deal of time at continuing education courses so that I can provide you with the latest research-based treatment in all areas of dentistry and care for you in as efficient and comfortable a way as possible. I am looking forward to getting to know you not just as patients but as friends. I want you to get to know me too. At appointments, you will likely hear me talking about something silly my wife said or the newest thing my 1 year old daughter has discovered. When I’m not at work, you will likely find me golfing, spending time on the river, or researching a new recipe to try on my family. I also have a passion for mission trips and have traveled to South America four times with medical missions teams from Woodlands Church. I am anxious to meet all of you in the coming months. If you ever have questions or need me in an emergency, I am just a phone call away. Please feel free to contact me anytime at the office or on my cell phone (715-630-7031).


Office Location

  • Wisconsin Rapids
  • 406 Daly Ave
  • Wisconsin Rapids, WI
  • 54494
  • Map & Directions
  • Call: 715-421-1515
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