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Central Office
Keith A. Christian, M.D.
Board Certified Specialist in Family Medicine
Med School: University of Cincinnati
Residency: Memorial Family Medicine Residency – South Bend, IN
Special Interests: Obstetrics, Endoscopy
Dr. Christian was born and raised in Fort Collins, CO. After finishing training in the Midwest, he feels blessed to be back in the Front Range with his wife and newborn son. Dr. Christian’s approach to family medicine is a physician alliance aiming to optimize each patient’s physical, emotional, and spiritual wellbeing.
Douglas A. Magnuson, M.D.
Board Certified Specialist in Family Medicine
Med School: University of Colorado
Residency: North Colorado Family Medicine
Dr. Magnuson is married with two children.
“Being a Greeley native, I am enjoying my practice here in Greeley, caring for the community in which I grew up.”
Erin J. Morley, M.D.
Board Certified Specialist in Family Medicine
Med School: University of Kansas, Salina
Residency: North Colorado Family Medicine
Special Interests: Full-spectrum family medicine, women’s health and contraceptive management, adult and pediatric medicine
Dr. Morley is married with two children. She was born in the Philippines and traveled the world with her family doing mission work until they finally settled in Colorado which she considers home. She went to undergraduate and medical school in Kansas, but is glad to be back in Colorado to raise her family. She enjoys gardening, DIY home improvement, and spending time outdoors.
Heidi J. Nightengale, D.O.
Board Certified Specialist in Family Medicine
Med School: Oklahoma State University, Tulsa
Residency: Oklahoma State University, Lawton
Special Interests: Pediatrics, women’s health and adult medicine, and osteopathic therapy, emphasizing holistic care.
“When not at work, I enjoy the beautiful Colorado outdoors, church, cooking, spending time with friends and family, and traveling.”
Joy K. Ruff, M.D.
Board Certified Specialist in Family Medicine
Med School: University of Pittsburgh School of Medicine
Residency: In His Image Family Medicine Residency – Tulsa, OK
Special Interests: Whole-family care, including pediatrics and women’s health.
“I am married with four children and grew up in Colorado, so it is great to be home! I enjoy a variety of outdoor activities including biking, hiking, skiing and camping, church and spending time with family and friends.”
D. Craig Wilson, M.D.
Board Certified Specialist in Family Medicine
Med School: University of Kansas
Residency: North Colorado Family Medicine
Dr. Wilson has been a family physician with Family Physicians of Greeley for 40+ years. He continues to serve families; some extending to 5 generations! He is married to Vicki and has 5 children and 6 grandsons. Dr. Wilson loves to read, travel, garden, and fish with his buddies and, of course, the grandsons. His personal statement reflects his passion for not only his patients but his strong faith in God. “God has blessed me with the ability to care for his children; every morning I wake up to a new day of expectation and gratitude.”
Nnenna O. Nwizu, DNP, FNP-BC
Board Certified Family Nurse Practitioner
School: University of Northern Colorado
Special Interests: Adult and geriatric medicine, preventive health and palliative care.
“I am married with three children. I enjoy cooking, traveling and spending time with family”.
Jessica M. Hersh, D.O., Ph.D.
Board Certified Specialist in Family Medicine
Med School: Texas College of Osteopathic Medicine – Fort Worth, TX
Residency: University of Texas, Family Medicine Residency – Athens TX
Special Interests: Obstetrics including C-sections
Cottonwood Office
Donna M. Brogmus, M.D., M.P.H.
Board Certified Specialist in Family Medicine
Med School: University of Illinois
Residency: University of Illinois
Masters of Public Health: Medical College of Wisconsin
Special Interests: Preventative health for teens, adults. Women’s health and mental health concerns.
“In my downtime I enjoy outdoor activities with my family and friends.”
Kelsi R. Brown, D.O.
Board Certified Specialist in Family Medicine
Med School: Rocky Vista University – Parker, CO
Residency: Southern Colorado Family Medicine – Pueblo, CO
Fellowship: Maternal-Child Health, St. Anthony North – Westminster, CO
Special Interests: Obstetrics
Dr. Brown was raised on the Front Range and is excited to come back to her roots and care for you and your loved ones.
Anna C. Puls, PA-C
Board Certified Physician Assistant
PA School: Des Moines University
Special Interests: Women’s health and contraceptive management, pediatrics and diabetes care.
“When not at work, I enjoy spending time in God’s creation with my husband and four sons. My garden is half weeds / half veggies and my house is never as tidy as I would like it to be, but I’m happy and wouldn’t have it any other way!”
Mark D. Young, M.D.
Board Certified Specialist in Family Medicine
Med School: University of Texas, Houston
Residency: North Colorado Family Medicine
Special Interests: Pediatrics, preventive health care
Johnstown Office
Cara E. Brown, M.D., caq Adolescent Medicine
Board Certified Specialist in Family and Adolescent Medicine
Med School: University of Missouri – Kansas City
Residency: St. Anthony’s Hospital, Oklahoma City
Special Interests: Women’s health and adolescent care including ADHD
Dr. Brown strives to improve and maintain her patients’ physical, emotional, social and spiritual health. She enjoys spending time with her family, being involved with her church, skiing, gardening, and pickleball.
Mandie L. Navarro, MD
Board Certified Specialist in Family Medicine
Med School: University of Texas Medical School at Houston
Residency: Valley Baptist Family Practice Residency – Harlingen, Texas
Languages: English and Spanish
Special Interests: Travel medicine, wellness care, and prevention and management of chronic disease.
My husband and I have three amazing children. We enjoy spending time traveling, hiking, and attending church as a family. I worked in a Family Medicine clinic near the Texas-Mexico border for 19 years before being invited to join Family Physicians of Greeley.
Scott J. Samuelson, M.D.
Board Certified Specialist in Family Medicine
Medical School: University of Wisconsin
Residency: St. Joseph Family Practice Residency – Wichita, KS
Special Interests: Full-spectrum family medicine including dermatology.
J. Matthew Brown, M.D., FAAFP
Board Certified Specialist in Family and Adolescent Medicine
Med School: University of Missouri – Kansas City
Residency: Anthony’s Hospital, Oklahoma City
Special Interests: Sports medicine and adolescent medicine
Dr. Brown’s approach to family medicine is to engage each patient, addressing their physical, emotional and spiritual needs. He believes in empowering each person through healthy choices, maintaining wellness, aiming for disease prevention, and assisting with chronic disease management to help patient’s live life to the fullest.
Samantha M. Poupore, M.D.
Board Certified Specialist in Family Medicine
Medical School: Creighton University – Omaha, NE
Residency: North Colorado Family Medicine Residency
Special Interests: Obstetrics
West Office
Daniel R. Clang, D.O.
Board Certified Specialist in Family Medicine
Med School: University of Health Sciences – Kansas City, MO
Residency: Michigan State University
Tamara S. Clang, D.O.
Board Certified Specialist in Family Medicine
Med School: University of Health Sciences – Kansas City, MO
Residency: Michigan State University
Special Interests: Hypertension, cholesterol, diabetes, osteoporosis
Alexander T. Grover, D.O., CAQSM
Board certified specialist in Sports Medicine and Family Medicine Current Team Physician of the UNC Bears
Med School: Rocky Vista University – Parker, CO
Residency: Southern Colorado Family Medicine – Pueblo, CO
Fellowship: Primary Care Sports Medicine/Team Physician, The Ohio State University
Special Interests: Sports Medicine: Former team physician at The Ohio State University and of the Columbus Clippers
R. Scott Haskins, M.D.
Board Certified Specialist in Family Medicine
Med School: University of Colorado
Residency: University of Wyoming
Kelly B. Johnson, AGNP-C, FNP-C
Board Certified Adult Gerontology Nurse Practitioner
Board Certified Family Nurse Practitioner
School: Walden University – Minneapolis, MN
“My husband and I moved to Northern Colorado in 2015 and we have two boys who keep us busy. I enjoy traveling, golfing, camping, and boating in my down time.”
Paul D. Lobitz, M.D.
Board Certified Specialist in Family Medicine
Med School: University of Minnesota – Rural Physician Associate Program
Residency: North Colorado Family Medicine
Special Interests: Pediatric and adult medicine, endoscopy/colonoscopy.
“Interests outside of work revolve around the joys and challenges of raising 6 children.”
Matthew L. Martinez, M.D.
Board Certified Specialist in Family Medicine
Med School: University of Colorado
Residency: Scottsdale Memorial – Scottsdale, AZ
Special Interests: Sports Medicine
Dr. Martinez was born and raised in Longmont, CO and has practiced in Greeley since 1997. He and his wife Patricia have two kids (Janelle and Joseph). He enjoys tennis, fishing, golf, snowboarding, and mountain biking.
Johanna C. McNair, M.D.
Board Certified Specialist in Family Medicine
Med School: De La Salle University College of Medicine – Dasmariñas, Cavite, PH
Residency: Southern New Mexico Family Medicine, Memorial Medical Center – Las Cruces, NM
Special Interests: Whole family care, obstetrics, pediatric and adult medicine
Chima C. Nwizu, M.D., FAAFP
Board Certified Specialist in Family and Obesity Medicine
Diplomate, American Board of Clinical Lipidology
Med School: University of Benin – Benin City, Nigeria
Residency: Bronx-Lebanon Hospital – Bronx, NY
Harlem Hospital (General Surgery) – New York, NY
Santa Clara Valley Obstetrics Fellowship – San Jose, CA
Special Interests: Whole-family care, weight loss (opens in new tab), hospital care, obstetrics, including cesarean section. Specialist in cholesterol management, heart disease and stroke risk reduction.
Michelle K. Paczosa, D.O.
Board Certified Specialist in Family Medicine
School: Western University of Health Sciences
Residency: St Joseph’s Hospital, Denver
Special Interests: Complete family care, women’s health, pediatrics and aesthetic services including BOTOX (R) and Fillers.
Dr. Paczosa enjoys spending time with her family, outdoor activities and traveling.
Kyle B. Waugh, M.D.
Board Certified Specialist in Family Medicine
Med School: University of Oklahoma
Residency: University of Oklahoma
Special Interests: Whole-family care, minor surgical procedures, vasectomy and diabetes management.
