Faculty & Current Residents

View faculty biographies below or read about current resident students by year:


    Sherman Straw, M.D., FAAFP

    Dr. Straw (Sherm) loves teaching residents! He became our director after 25 yrs experience with our program. Sherm has been: a resident, part-time faculty-when in private practice, full-time faculty, assistant director, and associate director. His focus is making complex things simple, individualizing residents' education & always teaching from current articles & EBM. He graduated from Northern Arizona University then Med School at the University of Arizona where he met his wife Betsy, who is a Middle School Teacher. They have 5 children; 1 blue, 4 pink, 4 horses & 5 dogs. Weekends find Sherm exploring our spectacular mountains, eating freshly caught trout & recharging in the wonder of Colorado's wilderness.

    Sabrina Mitchell, D.O., CAQ, Assistant Director

    Dr. Sabrina Mitchell was raised, skiing, in Mammoth Lakes, CA. She received her BS in Physiology from UCSD & graduated from University of New England, College of Osteopathic Medicine; residency was at MSU-Sparrow in Lansing, MI. She then headed for sunnier climates moving to Farmington, New Mexico where she worked in a community health center, then opened a private practice & took on the job of Medical Director for Northwest New Mexico Hospice. Sabrina’s passions are hands on Osteopathic Manipulation, Palliative & End of Life care, & Non-Diet Weight Management. She is double boarded in Family Medicine and Hospice and Palliative Medicine. She has two daughters & enjoys riding her motorcycle, cooking, singing & teaching herself guitar. Her family is really enjoying all the great outdoor activities of the Grand Junction area.

    Keith Dickerson, M.D.

    Dr. Keith Dickerson was born and raised in Reading, PA. He received his BS in electrical engineering and MS in biomedical engineering from Drexel University in Philadelphia, PA but felt drawn to a career in medicine.  He graduated cum laude and AOA from medical school at MCP in Philadelphia and completed his residency in Family Medicine at the University of New Mexico in Albuquerque. He then completed a four year Air Force commitment prior to joining St. Mary's in 2004. His current areas of professional focus are hospitalist/inpatient medicine, adult learning theory and practice, and graduate medical education optimization.  He, his wife Teresa, and their daughter Sophia enjoy bicycling, hiking, Nordic and Alpine skiing, gardening, along with making music, in their spare time.

    Christopher Taggart, M.D.

    Dr. Chris Taggart has spent his post graduate career in residency education, most recently at the University of Rochester Family Medicine residency program. He waTaggart copys raised in Denver, CO and spent college, medical school, residency, and fellowship in Northeast Ohio. He received his BA in History from Case Western Reserve University and his MD from Northeast Ohio Medical University in Rootstown, OH. Residency and Hospice and Palliative Medicine fellowship were at Akron City Hospital in Akron, OH. After fellowship he worked briefly at Rose Family Medicine Residency program before following his wife to Rochester, NY. Where he was faculty for 4 years before joining us. He currently spends his free time with his family, especially enjoying watching his young son grow. He also likes to run, ski, hike, and travel on any adventure his wife plans.

    Caroline Dorman, M.D.

    Dr. Caroline Dorman comes to the faculty after practicing nine years in Craig, Colorado population 8,100. She brings a rural perspective to the care of patients. She has extensive experience in emergency care and obstetrics, covering this small rural hospital for nine years. Dr. Dorman grew up in Oregon and attended Reed College, then medical school at the University of Oregon and graduated from our residency program. She has three children. Dr. Dorman has been an activist in our state serving on the Copic Board and as the legislative chair of the Colorado AFP.

    Shannon Keel, M.D., FAAFP

    Dr. Shannon Keel grew up in Cortez, CO. After graduating from Stanford University she served in the Peace Corps in Cote d’Ivoire, West Africa. This experience led to her career in medicine at the University of Colorado, then residency in Denver. Family Medicine was a natural choice as it strives to care for the whole person & the whole family. Dr. Keel’s passion for the underserved led her to practice not far from home - at the Navajo Reservation in Shiprock, New Mexico. She speaks Spanish, enjoys OB, public health, & international medicine. Shannon had 4 yrs of residency faculty experience "back East" before joining us & was teacher of the year. Her husband, Thad, is a local Vet. Family time emphasizes camping, skiing, & biking with their two children Jack & Anna, & their 2 dogs.

    Paul Simmons, M.D., FAAFP

    Dr. Paul Simmons is a Colorado native.  After graduating with a degree in history from Baylor University, he attended the University of Colorado School of Medicine.  His family medicine residency was completed in Greeley, Colorado, where he was elected chief resident.  Dr. Simmons practiced family medicine including obstetrics, sleep medicine and endoscopy in rural areas of western Wisconsin and eastern Colorado, and was awarded the 2009 Rural Health Excellence Award by the Colorado Rural Health Center.  Since moving to Grand Junction, he has not only taught family medicine residents, but also undergraduate biology students and graduate nursing students at Colorado Mesa University.  His medical interests include physical examination, office procedures and evidence-based medicine.  Dr. Simmons and his partner, Courtney, have three neurotic dogs and enjoy traveling, hiking and good food.

    Monique Morisseau, M.D.

    Dr. Monique Morisseau comes to the residency with a strong commitment to the underserved.  She grew up in Rhode Island, attending the University of New Hampshire for undergrad then Dartmouth Medical School & Brown’s Family Medicine Residency.  Her initial practice was with the Indian Health Service in Northern Arizona working with the Hopi & Navajo.  Monique especially enjoys teaching OB Ultrasound & connecting new residents with the wonders of the area.  She has 2 daughters with her energetic Irish husband.

    Randall Reitz, Ph.D.

    faculty_reitzDr. Randall Reitz is our Director of Behavioral Sciences. He received a PhD in Marriage and Family Therapy from Brigham Young University. He directs our Medical Family Therapy Fellowship and the integrated mental health team.  His scholarly interests are professional identity development, trans-disciplinary training, and group medical appointments that he leads with our residents. Dr. Reitz speaks four languages (Spanish, French, Portuguese and English). Outside the clinic he is married to Ana Reitz, has three children, loves trail running, biking, and baking.


    Amy Davis, M.D., MPH, AAHIVM

    Dr. Amy Davis has been the medical director of the Ryan White HIV Collaborative Clinic at SMFM since 2000.  Her passion in medicine has been for special populations and for the underserved.  Her hometown is Queensbury, NY.  She received her B.S. in biochemistry from Cornell University in Ithaca, NY and then attended medical school at SUNY -Buffalo. She completed residency at Maine-Dartmouth Family Medicine Residency in August, Maine.  She practiced 4 years with the Indian Health Service on the Hopi Reservation before joining the SMFM faculty. Her husband Billi is an organic farmer. Together they have three children, Amelia, Flannery and Keino.

    Megan Lykke, MD

    Megan Lykke

    Dr. Megan Lykke graduated from St Mary’s Residency, and after practicing in rural southern Colorado for 6 years, she liked it enough here to come back! She went to undergrad at Seattle Pacific University and then medical school at Michigan State University College of Human Medicine. She enjoys full-spectrum family medicine. Dr. Lykke loves mountain biking, hiking, and Nordic skiing the Colorado’s great outdoors with her husband David and two boys

    Michael Olson, PhDOlson copy, LMFT

    Dr. Mike Olson comes to us from the University of Texas Medical Branch where he has worked for the last 11 years and directed their behavioral medicine program. Prior to that he worked at the University of Nebraska Medical Center in Omaha, NE, co-directing the behavioral medicine program and developing a medical family therapy Ph.D. program with the UN-L faculty. He attended Brigham Young University for undergrad and his Masters degree in MFT, then Kansas State University for his Ph.D. in MFT and a post-doc fellowship in behavioral medicine from University of Texas Medical Branch. He is married to Camille - they have five children, Taylor, Caden, Sophia, Lauren, and Anna. Outside interests include music (piano), art, hiking, and Alpine skiing with the family.

    Mike Reeder, DO, CAQfacultyreedersptsmed

    Dr. Mike Reeder attended Ohio University med school. He completed an ER Residency at Akron General & his Fellowship at Albany Medical Center in NY. He moved here to work with the Residency, Mesa State College (now Colorado Mesa University) & private practice. He's interested in all aspects of non-surgical orthopedics/sports medicine, exercise physiology, & biomechanics. He especially enjoys bicycling, cross-country skiing, & time with his expanding family.

    Cassana Littler, M.D. Pediatric Champion

    Dr. Cassana Littler grew up in Northeast Colorado.  She graduated from the University of Colorado in Boulder with a molecular biology degree.  After doing translational research in the Cardiovascular and Pulmonary research center at the University of Colorado, she decided to attend medical school and graduated from the University of Colorado School of Medicine in Denver.  She completed her residency at Blank Children's Hospital in Iowa and joined Western Colorado Pediatric Associates in Grand Junction.  She has been the liaison for the pediatric rotation for SMFM since 2011.  In her spare time, she enjoys hiking, skiing and exploring the outdoors.

    Tonya Cook, Pharm.D.faculty_cook

    Dr. Tonya Cook is our pharmacy faculty. She completed her decorate of pharmacy at the University of New Mexico and then completed a residency in Ambulatory Care at the Asheville VA in North Carolina.  Dr. Cook’s areas of interest include collaborative care, teaching, mental health, and pain management. Outside of work she enjoys reading, hiking and traveling.