Our Staff

Ryan Volz

Registered Dietitian


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

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 (all 4 years old and under) 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

Chiropractic Assistant

I moved from Ann Arbor to Holt in March of 2014 and already love the area. 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 in 2007. I became a CNA in2007 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 going on walks with my husband. My passions include music, drama and children.


Treair Boos

Office Manager

I grew up around Eaton Rapids and have lived around the area my whole life. I currently reside in Potterville. I spent about 12 years in the financial industry when I found myself wantin to pursue my passion of working in the medical field. Then I found myself here at Volz Family Chiropractic. I have been with my husband Randy for 6 years and we just celebrated our 1st wedding anniversary. I am also a proud mom to my daughter Taillor. I enjoy bowling and watching my daughter bowl and play basketball. I am also a big fan of the Detroit Tigers and Lions as well as a big reality TV follower, especially Big Brother and Biggest Loser. I have a serious obsession to the color purple and am a collector of dolphins. I am looking forward to getting to know all the patients and being part of the VFC family!


Kelly West

Chiropractic Assistant

I grew up in Holt and have lived in the area my entire life. I am blessed with a great family that I love to be with. My husband and I just recently celebrated our 25th wedding anniversary. I have a daugher and a son, and an adorable grandson. I enjoy reading, kayaking, and I love the beach and warm weather. My favorite times are hanging out with family and friends.