About Jackson Pediatrics

Jackson Hole, Wyoming

Serving our community since 1972

Jackson Pediatrics is the oldest and largest pediatric medical practice in Teton County. Our physicians work with infants, children, and adolescents through all phases of development. We are devoted to the comprehensive care of children in sickness and in health.

Jackson Pediatrics is the only facility in the region where your child will always be seen by a medical doctor, five days per week. We are on the medical staff of St. John's Health, where we provide neonatal, pediatric, and intensive inpatient care.

Meet Our Doctors


Jeremy Hertzig MD

Dr. Hertzig grew up in Williamstown, MA, and graduated from Middlebury College in Vermont with a B.A. in Biology. After college, Dr. Hertzig moved to Jackson, where he spent a few years skiing, fishing and enjoying the Mountain West. He returned to Vermont where he completed his medical school training at the University of Vermont and his pediatric residency at Vermont Children’s Hospital in Burlington. Dr. Hertzig then completed a fellowship in pediatric critical care at Seattle Children’s Hospital in Washington. After moving back to Jackson, Dr. Hertzig worked in hospitals in Colorado and Montana before starting the Pediatric Intensive Care Unit at Eastern Idaho Regional Medical Center in Idaho Falls. There he served as the Pediatric ICU Medical Director for five years. At Jackson Pediatrics, Dr. Hertzig brings his experience in acute care to the clinic, and is thrilled to be serving the local community.

When he is away from the office, Dr. Hertzig enjoys skiing, camping, hiking and traveling with his partner Danielle, her daughter Esme and their dog Thunder. He is also an avid fly fisherman, an amateur bird watcher and photographer and an all-around lover of the wildlife and wild places in this spectacular place that he gets to call home.


Tiffany Milner MD, FAAP, FACP

Born and raised in Texas, Dr. Milner did her undergraduate work at Duke University, where she earned a B.A. in Spanish and Latin American Studies. She returned to the Lone Star State for medical school, attending the University of Texas Health Science Center at San Antonio. Residency took her to the University of Utah Medical Center in Salt Lake City, where she completed a residency program in both Internal Medicine and Pediatrics, serving her final year as Chief Resident.

It was in Salt Lake City that Tiffany met her husband Jared, and they both became enamored with the Mountain West. She also discovered trail running, mountain biking, backpacking, and downhill skiing.

After residency, Tiffany began a faculty position at Dartmouth Hitchcock Medical Center and Geisel School of Medicine in Lebanon, New Hampshire, where she worked as a combined Internal Medicine and Pediatric Hospitalist. Tiffany has a strong interest in international and immigrant health. During her 4 years at Dartmouth, she spent 2014-2015 working as a Pediatrician in Rwanda, where she met Dr. Jim Little.


Travis Riddell, MD, MPH, FAAP

Raised in the San Francisco Bay Area, Dr. Riddell comes to us via Stanford University, where he earned his B.S. in Earth Systems.  He received his M.D. and Masters in Public Health from Oregon Health & Science University with honors, and completed his pediatric internship and residency at the Boston Combined Residency Program in Pediatrics.  In Boston he was a Teaching Fellow at Boston Medical Center, a Boston University teaching hospital, and a Clinical Fellow at Children's Hospital Boston, a Harvard University teaching hospital.  Dr. Riddell took over ownership of Jackson Pediatrics from Drs. Little and Ridgway in January, 2014.

In addition to his clinical work, Dr. Riddell has a strong interest in pediatric environmental health and has a record of published research among underserved populations in Nepal, China, and the Philippines.  He has also worked as a clinician in Nepal and Lesotho. Dr. Riddell serves at the Teton County Public Health Officer.

Travis and his wife Annie have two children: Case, born in 2014; and Lauren, born in 2015.  Travis has longstanding family ties to Jackson Hole and is a hiker, biker, climber, and backcountry skier with experience from the Teton Range to the Himalaya.  The Riddells consider themselves privileged to call this spectacular place home.


Keri Wheeler, MD, FAAP

Dr. Wheeler was born and raised in St. Cloud, Minnesota.  She attended Kenyon College in Gambier, Ohio where she received a B.A. in psychology with a concentration in neuroscience.  She worked for one year after college, then went on to medical school at The Ohio State University.  Dr. Wheeler met her husband, AJ Wheeler, on the first day of medical school.  He is an emergency department physician at St. John's hospital.  She did her pediatric internship and residency training at the Children's Hospital of Wisconsin in Milwaukee.

AJ, Keri and their then 18 month-old son, Mason, came to Jackson right after completing their residency training. She has been a part of the wonderful team at Jackson Pediatrics ever since then.  Since moving to Jackson her family has been blessed with the addition of their daughter, Ellie.  Along with work and spending as much time as she can with her family, Keri enjoys distance running, biking, backpacking, camping, and cooking.

Meet Our Staff


Jacki Aluyen

Jacki grew up in San Antonio, Texas and graduated with a B.A. in Fine Arts from the University of Texas at San Antonio. Aspiring to continue a higher education in medical illustration, she moved to Jackson Hole to focus on her art portfolio because the surrounding area has an abundance of beautiful sceneries and inspiration.

Working with Jackson Pediatrics is an exciting opportunity for Jacki as it gives her a chance to learn more about the medical field and engage with the local community. Besides operating the front desk, Jacki loves to spend her time drawing concept art, crafting paper projects, singing at karaoke, and ice skating.


Andy King, RN, OCN, PhD

Andy comes to us after spending the past three years as an oncology clinic nurse at St. John’s Health. He is excited to work with younger patients and their parents, ensuring thorough care from newborn to adolescence.

Andy and his wife, Liz, have raised three sons in this community: Colby is a senior at Carleton College, David is a first-year student at Bates College, and Bradford is a freshman at the Jackson Hole Community School.

Andy earned his nursing degree from Central Wyoming College, his PhD in physical chemistry from the University of Wisconsin-Madison (Go Bucky!), and his BA from Carleton College.

Cyra MacLellan


Cyra Maclellan

Front Desk Staff

MIssy Bio pic 1

Missy Matkin

Missy Matkin is our Clinic Manager. She joined Jackson Pediatrics in 2000. She has an in-depth knowledge of medical billing and practice management. She also serves as our bookkeeper. Missy enjoys working with the physicians at Jackson Pediatrics and is committed to making all family's experiences in our office a positive one.

A native of Montana, Missy is a graduate of the University of Montana. She has lived in Teton Valley for 30 years. She and her husband, Billy, have four children and three grandchildren.

In her free time, Missy can be found cheering for their kids at various softball, hockey and volleyball events around the area. She also serves as a 4-H leader and Advisory Board member. Their Victor residence is shared with 2 dogs, numerous horses and cows.


Brenda Reichert, RN

Nursing Staff

Hall of Fame / Emeritus


James Little Sr., MD, FAAP

Jackson's first pediatrician, Dr. Little retired in June, 2022 after 50 years in local practice.  (He is pictured above in the Tetons on Rock Springs Buttress, circa 1972.) According to the Jackson Hole News & Guide, "Dr. Jim Little Sr. started his profound tenure in Jackson in 1972 as one of only seven doctors in town.  Each one had a specialty--obstetrics, radiology, surgery--but they all pitched in on emergency calls.

"If Little hadn't settled in Jackson, the landscape of family care might have looked quite different today.  Surrounding communities in Teton Valley, Idaho; Star Valley; and Sublette County still don't have pediatricians.

"'I would see anybody that walked in the door,' Little said.  'Over the years I think that there were a number of kids that, you know, if I hadn't been there and done the right thing at the right time, they wouldn't be here.' He has since treated those kids' children and grandchildren."

We are here for you & your child

Healthy, happy children are our passion, and if you have any concerns for your child we would love to speak with you and schedule an appointment for your child.