Aristides Aristides K. Maniatis, MD, FAAP.

Dr. Maniatis is a Colorado native who graduated with a bachelor of arts degree from the University of Colorado, double majoring in molecular biology and biochemistry. He received his doctorate of medicine from Harvard Medical School. He then completed his residency in pediatrics at Children’s Hospital Colorado followed by his fellowship in pediatric endocrinology at the same institution. He is double-board certified in both pediatrics and pediatric endocrinology. His previous research includes publications on insulin pump therapy, antibody detection for type 1 diabetes, neuroendocrine complications of brain tumors, and newborn screening for congenital hypothyroidism. He has also written book chapters and academic reviews.

Dr. Maniatis is a member of the American Academy of Pediatrics, Endocrine Society, Pediatric Endocrine Society, and American Diabetes Association. He is on the advisory committee for the Colorado Newborn Screening Program as an expert in congenital hypothyroidism and congenital adrenal hyperplasia. The practice also provides the initial consultation for all babies in Colorado and Wyoming with an abnormal newborn screen in congenital hypothyroidism.

He lectures extensively on growth disorders and is a national key opinion leader on growth hormone therapy. He is also faculty with the non-profit organization Medical Education Resources and gives national lectures to primary care physicians on pediatric endocrine disorders. He was voted to 5280 Magazine’s Top Doctor list for pediatric endocrinology in 2016 and 2017.

Academically, Dr. Maniatis is affiliated with the University of Colorado Health Sciences Center and serves as a clinical preceptor for physician assistant students as well as a panelist on career development for graduating pediatric fellows from Children’s Hospital Colorado. He is extensively involved in clinical research including an epidemiologic study in type 1 diabetes, phase 2 and phase 3 trials in long-acting growth hormone therapy, phase 4 trials in daily growth hormone therapy, and a phase 4 trial in the metabolic bone disease hypophosphatasia.

Dr. Maniatis is fluent in Spanish and Greek. He is married and has two daughters. He enjoys traveling, SCUBA diving, and ballroom dancing.

Michaela B. Koontz, MD.

Dr. Koontz attended Vanderbilt University in Nashville, Tennessee, graduating summa cum laude, with a degree in biomedical engineering. She received her medical degree in 2001 from the Medical College of Georgia. Dr. Koontz then completed her residency in pediatrics and fellowship in pediatric endocrinology at Rainbow Babies & Children’s Hospital of Case Western Reserve University in Cleveland, Ohio. She is double-board certified in both pediatrics and pediatric endocrinology. Dr. Koontz was on faculty at Case Western Reserve University as an assistant professor of pediatrics and on staff as an attending physician at Rainbow Babies & Children’s Hospital from 2007 until she relocated with her family to Colorado in 2014. She was voted to Cleveland Magazine’s Best Doctor list for pediatric endocrinology from 2011-2014.

Dr. Koontz has published research on topics including nutrition in type 1 diabetes, diabetes care in school, psychosocial functioning in type 2 diabetes, and pediatric obesity. She has also written a book chapter and an academic review on short stature and growth-promoting therapies. She is a member of the American Diabetes Association.

Dr. Koontz is married and has 3 daughters. She and her family love the Colorado sunshine and scenery and spend most of their free time outdoors exploring their new home state. Dr. Koontz also enjoys cooking, traveling, yoga, skiing, and playing board games.

Mako Mako E. Sather, MSN, CPNP.

Mako earned her pediatric nursing diploma from the University Hospital in Giessen, Germany. She then became certified in the United States as a registered nurse (RN). She earned both a bachelor’s degree and master’s degree of science in nursing from the University of Phoenix. She completed her post-master’s program at the University of Colorado Health Sciences Center, and she is a certified Pediatric Nurse Practitioner. She has been working in pediatric endocrinology since 2001.


Mako is a long-standing member of the Pediatric Endocrinology Nursing Society. She is on the education committee and frequently gives lectures at their national meetings. She also serves on national nursing advisory committees for growth hormone therapy. In addition, she serves as medical staff for Camp Colorado, the annual diabetes summer camp. She is a member of the Sigma Theta Tau International Honor Society of Nursing.


Mako is fluent in German and Japanese. She is married and has a daughter and a son. She enjoys eating sushi, SCUBA diving, and triathlon competitions.