Make them wonder.

Make them wonder.

Feel Good. Look Good.

Muskegon Surgical Associates’ goal is to provide you great care and amazing results. Led by board-certified plastic surgeons Dr. Stephen Zonca, Dr. Dena Thayer, and Dr. Andrei Ostric, the team at MSA specializes in cosmetic and reconstructive procedures, as well as hand surgery.

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. He brings his wide range of surgical knowledge to help his patients in as many ways as possible.



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 Great Lakes Specialty Hospital and the Mercy Wound Care Center, as well as a diplomat of the American Board of Plastic Surgery.

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.


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 Great Lakes Specialty Hospital and the Mercy Wound Care Center.
Her special interests include breast surgery, breast cancer reconstruction, and body contouring. Dr. Thayer lives with her husband and 3 daughters in Norton Shores. In her free time, she’s all about the outdoors and tries to go running, sailing, and camping as much as possible.

Dr. S. Andrei Ostric is board certified by both the American Society of Plastic Surgeons and the American Association of Hand Surgery.


After earning his degree in Psychology from Knox College in Illinois, Dr. Ostric received his medical degree and did residencies in general surgery, plastic surgery, reconstructive surgery at Rush Medical College in Chicago. From there, he completed a Hand and Microvascular Fellowship at Southern Illinois University. Dr. Ostric focuses on his expertise in plastic and reconstructive surgeries on injuries and disorders of the hand. He and his family reside on the lakeshore.

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

She has recently joined the surgeons to provide excellent care with recommended treatments and procedures. She brings with her experience 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.

Amy is an occupational therapist and certified hand therapist.

Amy received her bachelor’s degree in health sciences and master’s degree in occupational therapy from Grand Valley State University. She worked as an occupational therapist at a large trauma center in Fort Wayne, IN before returning to MI. She worked in Fremont for 13 years as an outpatient OT. She obtained her hand therapist certification in 2007. Amy’s passion is helping patients reach their full potential after devastating hand or upper extremity injuries. When she is not working, she enjoys baking and spending time with family.

Amy Tardani is a registered nurse and a member of the Society of Plastic Surgical Skincare Specialists. 


Amy is a registered nurse who specializes in facial aesthetics. She has been a registered member of the Society of Plastic Surgeons for 10 years.

Amy is certified in all facial fillers and neurotoxins including Radiesse, Restylane, Juvederm, Botox, and Dysport.

She also specializes in Microlaser Skin Resurfacing using the Sciton Profile aesthetic laser for treatment of hyperpigmentation, rosacea, vascular lesions, and laser hair removal.

She treats many different skin conditions such as acne, pigment, fine lines and wrinkles using chemical peels and is able to bill insurance for treatment of acne.

Nicole Miller is a licensed aesthetician who performs chemical peels and microdermabrasion.


Nicole is a licensed aesthetician and works in skin care performing chemical peels and microdermabrasion. She is also certified through Permark in permanent cosmetics. Her expertise lies in applying permanent eyeliner, eyebrows, and lips, in addition to nipple tattooing for post-cancer reconstruction. Nicole is also trained in Xtreme Lashes and microneedling.  Nicole’s passion is helping her clients feel amazing about themselves.

Nikki is a Licensed and Nationally Certified Massage Therapist. Nikki is trained in a wide variety of Modalities such as: Therapeutic, Deep Tissue, and Trigger Point Therapies. She is also certified in Aroma Therapy and Reflexology. Nikki is skilled and trained in our skin care products. She is also trained in microdermabrasion, microneedling, reflexology, and AromaTouch Technique.

Sarah is a licensed massage therapist and is a member of the American Massage Therapy Association. She received her training at the Alexander School of Natural Therapeutics in Washington. Sarah is trained in a variety of massage modalities such as: medical massage, deep tissue, pregnancy massage, trigger point, and myofacial release. She is now accepting new clients.

Karly Kelley is the Operations and Sales Supervisor at MSA Plastic and Hand Surgery and Pure Medical Spa. 


Her number one priority is you, and she loves to make sure you feel at home here. Ask her any questions regarding our services, insurance, or anything else you can think of. She’s always happy to assist you in any way possible.

Cindy Witham is an experienced patient coordinator who assists you with your cosmetic, plastic surgery, or Pure Medical Spa needs.


Cindy is the voice of MSA. She answers your phone calls or email questions, schedules your appointments, and provides quotes on cosmetic services and skin care products.

Allison Jensen is MSA’s spa coordinator, a Certified Medical Assistant, and a licensed cosmetologist.

allison-jensenAllison specializes in the Jane Iredale makeup line.