John O’Brien, MD 1

John O’Brien, MD specializes in the care of children from birth to 18 years of age and has been serving the Mahaska Health community since 2009. Originally from Chicago, O’Brien loved science from a young age and wanted to apply that love of science to his love for helping people. Dr. O’Brien chose pediatrics because he has a soft spot for dependent patients and loves hearing how his young patients experience a happier life due to better health. Dr. O’Brien believes all children are capable of doing wonderful things. He enjoys helping them achieve their potential in good physical and emotional health. Dr. O’Brien has made great strides treating young people for Attention-Deficit/Hyperactivity Disorder (ADHD) and prides himself on educating parents.

In his spare time, Dr. O’Brien enjoys spending time with his grandchildren and 3 children who all reside in the Midwest.


University of Texas, Houston, TX

University of Texas Hermann Children’s Hospital, Houston, TX

Mahaska Health, Oskaloosa, IA