The Kooistra Mission

To provide excellent service to our patients in a comfortable and caring environment with the goal of helping every patient achieve better health.

Jared Kooistra

Dr. Jared Kooistra is the clinic director at Kooistra Chiropractic. He is a graduate of Hope College and Logan College of Chiropractic. Dr. Kooistra is a board-certified chiropractor with additional certifications in Active Release Techniques (ART), Selective Functional Movement Assessment (SFMA) and The Titleist Performance Institute (TPI). He also tested into the Elite Provider Network for Active Release Techniques, which makes up a small percentage of the most qualified Active Release Techniques practitioners.

Dr. Kooistra is married to Betsy and has three children Charlie, Liza and Miller.

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Mark Koldenhoven

Dr. Mark Koldenhoven graduated from Calvin College and went on to receive his Doctorate at the National University of Health Sciences and has been in private practice since 2007. His passion is helping his patients take the next step towards a healthy and pain free life. He accomplishes this by helping his patients meet their personal health goals by a variety of soft tissue and rehabilitation techniques, educating them on their condition, guiding them on personal exercise programs and nutritional advice. He is one of only a few doctors using a class 4 laser to help his patients and athletes get out of pain and enjoy their daily activities.

When he’s not practicing, he enjoys time exercising, golfing, and being with his four children Olivia, Elliott, Graham, and Winston.

Dr. Mark’s wife passed away in 2021 after a 4-year battle with colorectal cancer.

Claim to fame: 1st place in a weekend CrossFit competition.

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Kaitlynn Rosier

Dr. Kaitlynn is a native of Grand Rapids – she graduated from Forest Hills Central high school and went on to play basketball at Kuyper College. With her passion in sports and science, she moved to St. Louis and attended Logan College of Chiropractic, where she became proficient in many different techniques: Cox Flexion Distraction, Selective Functional Movement Assessment, Sacral Occipital Technique, Instrument Assisted Soft Tissue Mobilization and the Mckenzie Method.

With additional training in perinatal courses, Webster, and BirthFit, Dr. Kaitlynn is very passionate about caring for pregnant patients and their postpartum care. With chiropractic and physical rehab, Dr. Kaitlynn likes to help mothers train for birth and rehabilitate after giving birth.

Dr. Kaitlynn is married to her husband Ridge, both enjoying being in Grand Rapids and spoiling their dog. In her spare time, she enjoys playing basketball and being outdoors!

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Zach VanderWeide

Dr. Zach went to Grand Valley State University where he obtained a Bachelor’s degree in Clinical Exercise Science. He then went to Palmer College of Chiropractic to get his Doctorate of Chiropractic. Through these different programs, he gained first hand experience with multiple musculoskeletal conditions and complaints, as well as how to properly treat them. He utilizes this information each day to help his patients achieve wellness and a better quality of life.. On top of traditional adjusting techniques, Dr. Zach is efficient in the Activator protocol, various Soft Tissue ManipulationTechniques, Extremity Rehabilitation, and the Flexion Distraction table. His goal as a Chiropractor is to not only get patients well, but to give them the tools and knowledge to stay well!

In his free time, Zach enjoys spending time with family and friends, golfing, fishing, exercising, and enjoying the outdoors. Zach is married to Steffani and has two sons Bowen and Colsen

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Robert Flannigan

Dr. Rob’s mission is to educate and empower you so that you can do what you love. He emphasizes self treatment, movement, and prevention so pain and injury don’t limit your life. He obtained his doctorate from National University of Health Sciences in Chicago, and is trained in Motion Palpation (MPI), the McKenzie Method (MDT), and Dynamic Neuromuscular Stabilization (DNS).

Dr. Rob competed in cross country, track, and club gymnastics at the University of Cincinnati. While from Ohio, he asks that you not hold that against him. You can find Dr. Rob running, working out, and enjoying the natural beauty of SW Michigan when not treating patients.

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Our Team






Massage Therapists

Julie Christopher

Danielle Archer

Laurel Shippert