• Program Faculty

  • Dr. Flint is originally from the mountain town of Big Bear Lake in southern California. He completed his undergraduate and medical school education in the Los Angeles area at Azusa Pacific University and Western University's College of Osteopathic Medicine of the Pacific. He moved out to Colorado for residency, training at Rose Family Medicine Residency in Denver. After five years in private practice he joined St. Anthony's to fulfill his passion for teaching. Ryan has an outpatient focus and his medical interests include prevention, chronic disease management, and musculoskeletal/sports medicine, including osteopathic manipulative therapy. He remains passionate about bringing medical care to all, and has made three overseas medical missions trips to Ethiopia. Ryan enjoys camping, skiing, relaxing with his wife and four children, and trying to go to as many Denver Broncos' games as possible. RyanFlint@centura.org .
    Beth Groff, MDDr. Groff grew up in Pennsylvania and attended Williams College in Massachusetts for college, majoring in English and Women's Studies. After a year of travel, she headed to Philadelphia for medical school at the University of Pennsylvania. During a "Year Out" from Penn, she traveled to Costa Rica, Ecuador and Kenya, learning more about medicine and life along the way. She completed her residency in beautiful Asheville, North Carolina. Wanting to speak Spanish and deliver babies, she moved to Colorado to work with Salud Family Health Center in Brighton. At Salud she practiced full-spectrum family medicine for ten years, focusing on the care of underserved patients. She is thrilled to have joined the residency in 2011, where she is the Associate Program Director at the 84th Ave Health Neighborhood site. She is also involved in organizing the Global Health Interest Group, including work with the Centura program in Haiti. Outside of work, she loves to garden, cook and practice yoga. Her husband and two young sons keep her updated on the Colorado Rapids soccer team among other things. ElizabethGroff@centura.org.
    Dr. Diaz grew up in the Midwest as a Hoosier, graduating from Indiana University for undergrad and moving on to Des Diaz, SaraMoines University for medical school. She met her husband there and they couples matched at St. Joe’s in Denver for their family medicine residency. After graduating residency, they temporarily relocated back to Indianapolis for her husband to do a sports med fellowship, but missed the mountains and sunshine of Colorado. She since returned with her family to the Congress Park neighborhood, where she and her family enjoy the amazing park system Denver has to offer and close access to the mountains. Sara had an interest in integrative medicine early in her training and supplemented her residency curriculum with acupuncture training. After graduating residency she continued her education in complementary and alternative modalities including nutrition, functional medicine, yoga therapy, safe/evidence based use of supplements, and specifically holistic women’s healthcare. In her free time you will find her hiking, doing yoga, singing with her husband in their family band, loving on her daughter Olivia, and enjoying good food and wine. SaraDiaz@centura.org

    Megan Harper, MDA native of Colorado, Megan Harper received a bachelor’s degree in molecular, cellular and developmental biology from the University of Colorado at Boulder. She earned her medical degree from the University of Colorado where she was inducted into the Alpha Omega Alpha Medical Honor Society. She completed her family medicine residency and an obstetrics fellowship at Saint Joseph Hospital in Denver.

    Board-certified, Dr. Harper is trained to care for patients of all ages. She is dedicated to providing friendly, compassionate and high quality care to all her patients. Her clinical interests include: general and chronic medical conditions, preventive care, women’s health, and obstetric care.

    Outside of the office, Dr. Harper enjoys spending time with family, traveling, hiking, and golfing, and is an avid college sports fan.

    Sarah Liegle, MDDr. Liegl grew up in Denver and got her BA in History from Grinnell College in Iowa. She spent a hectic year in Johannesburg, South Africa doing HIV counseling before attending medical school at Loyola University in Chicago. Sarah completed her residency and learned Spanish in Greeley, CO where she was on the community health center ("Sunrise") track. Following residency, Sarah went to a very urban clinic in Washington DC where she did her National Health Service Corp Scholar obligation. It was at this site where she fell in love with residents and teaching, and went on to become faculty at the Georgetown Family Medicine Residency.  Tired of traffic and wanting to be close to family, Sarah convinced her husband to move back to Denver in 2013 and is thrilled to continue in an academic position at St. Anthony North. Her medical interests include all things women's health, pediatrics, international medicine, and caring for underserved populations. Outside of work she keeps busy with her two kids, and enjoys running, reading, and travel.  SarahLiegl@centura.org.
    Matt Ludemann, MDDr. Ludemann grew up in the 'burbs' of Chicago, brainwashed from the time he could walk into becoming a die-hard Chicago Cubs and Notre Dame fan. He stayed in Chicago for undergraduate and medical school at Northwestern University. He met his wife, Julianna, there and the two wisely left the Midwest for Colorado. Matt completed his Family Medicine residency at St. Anthony in 2009 and his chief residency in 2010. He and Julianna have two small children, Alice and Will. They enjoy spending their spare time hiking and cross-country skiing the quietest trails they can find in the high country and travelling as much as possible. His interests include teaching Evidence-Based Medicine and High Value Cost Conscious Care. MatthewLudemann@centura.org.
    John Miller, MDDr. Miller received his undergraduate degree from Colorado State University in 1969 and graduated from the University of Colorado School of Medicine in 1973. He completed his family practice residency at the University of Colorado. He was in private practice in Albuquerque, NM for two years from 1976 through 1978 while patiently waiting for his wife, Kathy, to finish her residency. He then joined the Indian Health Service and was stationed in Gallup, NM where he was involved in training of Physician Assistants and, later, was chief of the Family Medicine Department. He was in private practice in Canon City, CO from 1983 until he joined the St. Anthony faculty in 1991. John has greatly enjoyed his chance to be involved in resident education and primary care research. JohnMiller@centura.org
    Nancy Robertson, PharmDNancy received her PharmD. from the University of Missouri, Kansas City and completed a Clinical Pharmacy Residency at Truman Medical Center in Kansas City. Nancy taught at the College of Pharmacy at the Medical University of South Carolina in Charleston for four years. After teaching at the CU School of Pharmacy for one year, she retired to part-time practice to allow more flexibility for her family. She and her husband have two children and a golden retriever. Nancy enjoys quilting and gardening.  Areas of interest include adverse drug reactions and drug interactions. In addition to teaching, she is involved in the chronic disease management program, INR clinic with warfarin monitoring, and helping patients get enrolled in patient assistance programs. NancyRobertson@centura.org.
    Laura Strickland, MDDr. Strickland grew up in Milwaukee, WI and attended Northwestern University for undergrad. As the world is small, she met fellow faculty Matt Ludemann and his wife, Julianna, during her freshman year of college. She has been destined to live in Colorado and work at St. Anthony ever since. After college, she spent a year doing a volunteer program with Jesuit Volunteer Corps in San Francisco. She returned to Wisconsin for medical school and residency at the Medical College of Wisconsin in Milwaukee and University of Wisconsin-Madison respectively.  Following residency, she took a faculty job at Boston University School of Medicine, where she worked at an FQHC, and taught full spectrum family medicine to BU medical students. She loved Boston, but has found her home in Colorado. She spends her free time hanging out with her husband, son and their dog... preferably outdoors.  LauraStrickland@centura.org .

    Krystal Tamura, MD Dr. Tamura was born and raised in Longmont, Colorado and completed medical school at University of Nebraska Medical Center in Omaha. She was fortunate enough to be able to come back to Colorado for residency at St. Anthony North, and after completing residency in 2014, had the privilege to stay on as the faculty development fellow. 


    Dr. Tamura is now a full time faculty and inpatient medical director. Her areas of interest include OB and women’s health. Even with the busy schedule, she always makes time to be with her husband and daughter. She loves to cook, hike, read, and play poker. She is very happy to stay at St. Anthony and looks forward to the many great experiences to come. KrystalTamura@centura.org

    Kim WalterDr. Walter earned her BA in Psychology from Ball State University and her MA and PhD from Purdue University. She also received her graduate teaching certificate while at Purdue. Her doctoral dissertation was on building a collaborative care model for integrating mental health into primary care (before PCMH was ever created!) After grad school, Kim followed her husband's career path first to Tennessee and eventually to Colorado. Kim has experience in both inpatient and outpatient mental health in a variety of medical settings from private medical offices to corporate healthcare systems.  Kim joined the behavioral science faculty at St Anthony's in 2011.  She has particular interest in resident teaching and integrated mental healthcare. Kim enjoys cooking, gardening and travel. She spends much of her free time outdoors with her husband camping, boating, or animal watching in the mountains. KimberlyWalter@centura.org .

    Christina Zarza, MDDr. Zarza received her bachelor’s degree from the University of Colorado at Boulder in both Spanish Literature and Biology. She graduated Summa cum laude and also completed a Neuroscience certificate. Dr. Zarza earned her medical degree from the University of Colorado Health Sciences Center. She completed her residency at St. Anthony North Family Medicine Residency program and served as co-chief resident her final year. 

    Fluent in Spanish, some of her medical interests include pediatrics, community medicine, and global health. When she is not delving into the complex world of medicine, she enjoys hiking, reading, baking, traveling, and spending time with family and friends.

    Born and raised in Ithaca, New York, Trevor Harrington, DO received her bachelor of science degree in physiology from McGill University in Montreal, Canada. After graduation, she moved to San Francisco working as an EMT and clinical researcher before finally landing in medical school. She completed her doctorate at Touro University College of Osteopathic Medicine in Vallejo, California. Dr. Harrington is receiving advanced medical training at St. Anthony North Family Medicine.

    Dr. Harrington provides full-scope primary and acute care services. Her medical interests include adolescent health, addiction treatment, women's health and healthcare reform.

    In her free time, Dr. Harrington is a climber, skier and former ballet dancer.

    Joshua Reiher, DOBorn and raised in Wisconsin, Joshua Reiher, MD completed his bachelor’s degree at Indiana University in Bloomington, Indiana. After college, he worked as a research assistant with the Empirical Ethics Group at the Medical College of Wisconsin for a couple years exploring ethical issues and professionalism in academic medicine. He fell in love with the infinite array of opportunities in the world of medicine and decided to return to school to become a doctor.  Dr. Reiher is receiving advanced medical training at St. Anthony North Family Medicine.

    He traveled to Utah and Colorado to complete his pre-med courses while working as an EMT. Eventually returning to the University of Wisconsin School in Madison to complete his medical degree. 

    Dr. Reiher has a keen interest in behavioral health, doctor-patient communication, palliative/hospice care and working with patients with disabilities. He is also very interested in integrative medicine which focuses on mind, body, spirit and nutrition. 

    When he’s not seeing patients, Dr. Reiher enjoys trail running, biking, skiing, climbing mountains, reading and cooking tasty food.

    Matthew Mullane, MDMatthew Mullane, MD, MPH graduated from the University of North Carolina – Chapel Hill with a degree in political science with minors in Spanish and chemistry. Taking some time to explore after college, he worked briefly as a research assistant in a pediatric gastroenterology laboratory. Dr. Mullane is receiving advanced medical training at St. Anthony North Family Medicine.

    This stirred his interest in medicine, so he decided to enter medical school. He completed an MD/MPH (Masters of Public Health) program at University of Texas School of Medicine at San Antonio and the University of Texas School of Public Health.

    Dr. Mullane has developed an interest in global health and underserved medicine, and has traveled to the Dominican Republic, Haiti and India on several medical and public health trips.

    In his free time, you'll find Dr. Mullane trying to improve his skiing, tending his vegetable garden or writing and recording music.

    Carissa Fralin, LCSW

    Carissa has lived in a number of states, growing up in Orlando, Florida and Fremont, California. She graduated from Manchester University (North Manchester, Indiana) in 1991 and stayed in the Midwest for several more years until moving to Colorado for graduate school.

    Carissa graduated in 1997 from the University of Denver with her Masters in Social Work and is a Licensed Clinical Social Worker.  She has worked most of the last 20 years in the Denver Metro area. Carissa has worked as a Social Worker in the non-profit setting, child protection, geriatrics, and many facets of health care.  She joined as Behavioral Health Faculty in April, 2016, where she also supervises the Integrated Care Team. She is also affiliate faculty at Metropolitan State University in the Social Work Department.

    Carissa became “stuck” in Colorado after meeting her husband, Joe, who is a native. They have one son, Vaughn, and she is grateful to now call Colorado home. She enjoys spending time with family and friends, being involved with her church, traveling, reading, and cooking. She also enjoys all things fantasy/sci-fi including attending Denver Comic Con yearly.

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