He was a surgeon who operated on Harrison Morgan when his appendix ruptured.
Dexter Morgan received a call while at work that his son, Harris, had been taken to Saint Peter's Medical Center. When Dexter arrived at the hospital, the doctor told him that Harrison’s temperature was 104, his appendix had ruptured, and he needed immediate surgery. Dexter signed the parental consent form and Harrison was wheeled to surgery.
Later, the doctor told Dexter that the surgery was successful, and Dexter enthusiastically thanked him.