Jeffrey P. Davis, MD

Dr. Davis is board certified by the American Board of Family Medicine. He is an advanced fellow in regenerative and functional medicine through the American Academy of Anti-Aging Medicine. He completed his residency in Family Medicine through University of Kansas at Via Christi Hospital in Wichita, KS and earned his medical degree from the University of Texas Medical Branch at Galveston. He holds a bachelor of arts and masters of clinical gerontology from Baylor University.
Jeff is married to Julie Davis. They've moved out to the country with their four children and have brought horses, chickens and a donkey into their family. Most days Jeff dreams about being a cowboy.


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Kristen R. Marvin, ND

Dr Marvin is licensed by the state of Kansas to practice naturopathic medicine. She graduated magna cum laude at National University of Health Sciences in Chicago, IL, one of seven schools accredited by the Association of Accredited Naturopathic Medical Colleges. Her areas of practice include but are not limited to: Family Medicine, Preventative Health, Nutritional Intravenous Therapy, Women's Health, Pediatrics (including those with special nutritional needs), Gastrointestinal Health, Thyroid and Adrenal Health, Lifestyle and Nutritional Counseling.
MarvinsKristen was born and raised in Wichita, KS. She played college basketball at Friends University, where she was a two-time First Team All-Conference player and an Academic All-American. When she's not working, she can be found practicing yoga, walking her dogs around College Hill, or sitting on a patio with her husband, Tim, sharing good food and a glass of wine.

Joleen Zivnuska, APRN, MSN

Joleen is a Women's Health Nurse Practitioner with more than 25 years of experience in women's health care including labor and delivery, perinatal medicine, bio-identical hormone replacement therapy, reproductive endocrinology and research, infertility, general obstetrics and gynecology. Joleen grew up outside of Manhattan, Kansas, and attended nursing school at Wichita State University then returned to WSU for her master's in nursing. Joleen joins Dr. Davis in delivering comprehensive gynecological services, including fertility and sexual dysfunction.
Joleen grew up on the backside of a horse, on a cattle ranch thirty miles south of Manhattan.  One of her chores as a kid, was to take care of whatever
animal was sick at the time.  Her passion for helping restore health, has been life long.  She loves working with horses, and currently competes in Ranch Sorting. She is married to Phil, who is a dentist.  He has been her best friend for 25 + years.  She has two children who are both in college. 

Approximately five years ago I became so disillusioned with traditional medicine that I was planning to just quit and work with my horses full time. Thankfully Jan Gerber introduced me to functional medicine, treating the root causes of dysfunction, so the body can try to restore itself. I am constantly in awe of our bodies ability to restore itself!  Now my passion for helping restore health, is back stronger than ever!!


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Safia Lyon, APRN

Safia was born and raised here in Wichita, KS. She completed her BSN at Wichita State University in 2007.  As an RN, she worked in the ER, cosmetics, and clinical practice.  She earned her MSN through Walden University in 2016 and is a licensed Family Nurse Practitioner.  She is scheduled to complete additional training through the Institute of Functional Medicine this spring. 

Safia and her husband, James, have 3 children who keep them busy. They enjoy family game nights, snuggle movie nights, and spending weekends in Cassoday, KS soaking in the fresh air and beautiful Kansas scenery.  Safia loves arts and crafts, cooking, dancing, and laughing.