DANIEL CALLISTO

Dr. Daniel Callisto, DO, FACOP, serves as the Medical Director at Integrated Source One, Inc., a Direct Primary Care (DPC) practice dedicated to providing affordable, high‑quality primary care for employees and their families. In his role, Dr. Callisto emphasizes a patient‑centered approach that eliminates insurance middlemen, offering transparent pricing, same‑day appointments, and direct communication via phone, text, and video visits. He believes that by focusing on preventive care and building long‑term relationships, patients experience better health outcomes and lower overall costs.

With more than three decades of experience in pediatrics and adolescent medicine, Dr. Callisto brings a deep clinical background to the DPC model. He graduated from the University of New England College of Osteopathic Medicine in 1987 and has practiced across Ohio, including roles at Lima Memorial Health System and other regional hospitals. His commitment to the DPC philosophy reflects his dedication to accessible, continuous care for children and families.