Daniel Gruenstein, MD

Dr. Gruenstein provides acquired heart disease care for children and adolescents, and congenital heart services for adults and children of all ages.

Not a stranger to Maine, Dr. Gruenstein attended summer camp in Maine as a kid and spent his college summers in the pine tree state serving as a camp counselor.

Dr. Gruenstein has many years of experience treating complex, high acuity patients, engaging in research, and training the next generation of cardiologists. He earned his medical degree from the University of Cincinnati College of Medicine and completed a residency in pediatrics and a fellowship in pediatric cardiology at Cincinnati Children’s Hospital. Prior to arriving in Maine, he served as associate professor at the University of Chicago.

In the next phase of his career, Dr. Gruenstein looks forward to helping patients and families navigate their journey through evaluation, diagnosis, and treatment in the outpatient setting.

“My goal every time I walk into a child’s patient room is to treat them as I’d like my own children treated,” he says. “Establishing that trusting relationship with parents and families immediately is so important. If I can achieve that in the first visit, there’s a level of trust going forward that makes all the difference.”

While his practice is largely focused on children and adolescents, Dr. Gruenstein treats adults with congenital heart disease. He is the only physician north of Portland certified in Adult Congenital Heart Disease by the American Board of Internal Medicine.