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Make them wonder.

2841431968 - About

Make them wonder.

Feel Good. Look Good.

MSA Plastic Surgery’s goal is to provide you great care and amazing results. Led by our board-certified plastic surgeons, Dr. Stephen Zonca, Dr. Dena Thayer, and Dr. Ryan Ter Louw, the team at MSA specializes in cosmetic and reconstructive procedures.

We believe in giving you an exceptional experience. Patients from Muskegon, Grand Haven, Spring Lake, and more come to our office for the beautiful, relaxing setting.

What makes us different is that we focus on getting to know you and our staff goes out of their way to make you feel at home. This allows us to work together to achieve your goals. This is how we ensure you’ll leave feeling happy, confident, and beautiful.


We’ll make you feel right at home.

We’ve assembled a team of outstanding medical professionals to provide plastic surgery and medical spa services to the Muskegon, Grand Haven, Spring Lake and the surrounding areas. Learn more about your team.

Dr. Stephen Zonca is a board-certified plastic surgeon with a background in general surgery.

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Dr. Zonca brings his wide range of surgical knowledge and experience to help his patients. After attending Wayne State University Medical School, he completed 7 years of surgical training in general and plastic surgery at Wake Forest University. During his training, Dr. Zonca won multiple awards for his work with medical research projects. He is passionate about finding better ways to help patients, and that’s why he continues to participate in research efforts to this day. In addition, he is the co-director of wound care at SelectSpecialty Hospital and the Mercy Wound Care Center, as well as a diplomat of the American Board of Plastic Surgery.

Dr. Zonca has been featured as a Top Doctor in Grand Rapids Magazine in 2019 and 2020.

Dr. Zonca performs a full spectrum of surgical procedures with special interest in breast augmentation, tummy tucks, and comprehensive facial rejuvenation, including minimally invasive office procedures.

Dr. Dena Thayer is board-certified in plastic and reconstructive surgery.

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She received her medical degree from Des Moines University in 1997 and completed her training in general and plastic surgery at the Philadelphia College of Osteopathic Medicine in 2004. During her time in Philadelphia, she cared for melanoma patients at the world-renowned Memorial Sloan-Kettering Cancer Center in Manhattan and spent six months at the Burn Center at Westchester Medical Center in Valhalla, New York. Since then, she has been practicing in West Michigan and performs surgery at Mercy General Health Partners, North Ottawa Community Hospital, and the Muskegon Surgery Center. She is the co-director of wound care at Select Specialty Hospital and the Mercy Wound Care Center.

Dr. Thayer has been practicing in West Michigan for 15 years. She is passionate about breast cancer treatment and reconstruction. She enjoys guiding patients through the process of breast reconstruction. MSA incorporates the latest technology in breast cancer reconstruction, including intraoperative audiography (to improve postoperative healing and outcomes), prepectoral reconstruction with acellular dermal matrix grafts, and oncoplastic reconstruction using the patient’s own tissue. She works with a team of dedicated breast surgeons and oncologists to deliver the best possible care and outcome for her patients.

In her free time, she’s all about the outdoors. Her interests include triathlons, running, hiking, camping and sailing. She has three teenage daughters and as a family they enjoy soccer, ice hockey and track.


Ryan Ter Louw, M.D. is a board-certified plastic surgeon who completed his undergraduate studies at Hope College and attended medical school at the University of Iowa.

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He went on to attend Georgetown University in Washington DC for his plastic and reconstructive surgery residency.  Afterward, he completed a fellowship in facial reconstruction at the Royal Free Hospital in London, England and Erasmus University Hospital in the Netherlands.

Dr. Ter Louw offers a wide range of aesthetic and reconstructive surgeries including surgery of the hand. He specializes in reconstruction of head and neck, skin cancers as well as facial reanimation after facial paralysis.

His interests include facial reconstruction, skin cancer, migraine headache surgery, breast reconstruction, surgery of the hand and cosmetic surgery. He is currently accepting new patients.

Dr. Ter Louw and his wife reside on the lakeshore and enjoy the outdoors, traveling, and spending time with their family.

Karyn McCollum , ANP-C, is board certified with the American Association of Nurse Practitioners.

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Karyn is experienced in wound care and hyperbaric medicine. She received her Bachelor of Science in Nursing from Michigan State University in 2005 and a Masters in Nursing from the University of Cincinnati in 2012. She resides in Grand Haven with her family and enjoys running and Lake Michigan.