Dr. Kreienkamp completed his undergraduate degree at Saint Louis University, where he studied Chemistry and Economics. He then entered the MD/PhD program at Saint Louis University, where he received a PhD in Biochemistry & Molecular Biology and MD. His PhD studies were focused on the pathophysiology of Hutchinson-Gilford Progeria Syndrome, a rare premature aging disease. He then completed his residency in pediatrics at St. Louis Children's Hospital, before coming to Boston Children's Hospital for his pediatric endocrinology fellowship.

Dr. Kreienkamp is a physician-scientist. His research is focused on the genetic causes of diabetes. Specifically, he is interested in characterizing rare genetic causes of diabetes, as well as studying how genetic tools can improve the care and recognition of the more common type 1 and type 2 diabetes.

Currently, he serves as the Director of the Diabetes Genetics Clinic at Boston Children's Hospital, and he is a member of the teplizumab team at Boston Children's Hospital. He is dedicated to the care of all of his patients with pediatric endocrine conditions, seeing patients across the spectrum of pediatric endocrine conditions.