Our Staff

Ryan Volz

Registered Dietitian Ryan Volz


Ryan Volz is our Registered Dietitian and Dr. Volz's wonderful husband of nearly 8 years. Ryan graduated from Life University in 2002 with a degree in Dietetics. He completed his one year internship at Barnes-Jewish Hospital in St. Louis, Missouri to become a REGISTERED Dietitian. People often wonder what the difference is between a Registered Dietitian and Nutritionist. The biggest difference is the amount of education an RD must have; 4 years with a 1 year internship and the exam to pass to have the credentialing. Ryan's focus is on preventative care and teaching healthy and natural lifestyle/habit changes for the well being of the body. Ryan specializes in nutritional counseling and supplying quality supplements and vitamins to help people regain and maintain their optimal health. Ryan also cares for people with diabetes, high blood pressure, high cholesterol and many other health challenges. In addition to being a husband and RD, Ryan is also an amazing father to he and Dr. Volz's 3 children, Jake, Jordan and Hayden.




Brenda Clark

Brenda Clark

Chiropractic Assistant


Brenda Clark is the wonderful mother of Dr. Volz and has been working at the office longer than any other staff member. Actually, she helped open the office in October 2005. Brenda and her husband, Jim, have owned & operated a packaging and shipping business in Okemos called PostNet since 1995. Brenda has two daughters, five grandchildren and has been happily married for over 36 years. In addition to working at the office she is now a full time grandma and helps both of her daughters often with her grandchildren!!





Christina Castonguay

Christina Castonguay

Chiropractic Assistant

I moved from Ann Arbor to Holt in March of 2014. I worked for a Chiropractor when I was in High School and have been under Chriopractic care my whole life. I attended college at Rosedale Bible College in Ohio and received my Associates degree in General Education with emphasis on music and acting in 2007. I became a CNA in 2007 but missed working in the Chiropractic field, so I became a Chiropractic Assistant in 2008 and have never looked back! My favorite part of working in this field is being able to watch people walk out of the office looking and feeling better without drugs or surgery. I love the outdoors and enjoy spending time with my husband Zac and my 2 children; Zeva and Balor. My passions include music, drama and children.


Kelly West

Kelly West

Office Manager

I grew up in Holt and have lived in the area my entire life. Go Holt Rams! I have an awesome family. My husband and I have been married over 30 years. I have a son, daughter, son-in-law, and 3 grandsons that I absolutely adore. I enjoy reading, going to the beach and warm weather. My favorite times are hanging out with my family and friends. I've been at Volz Family Chiropracitc since 2016 and I love our amazing doctors and staff. We have some of the greatest patients too!


Alyssa DavisAlyssa Davis

Chiropractic Assistant

Born, raised and reside in the great city of Holt! I am happily married to my best friend. I have two beautiful children whom I adore. I love working for Volz Family Chiropractic part time.