Character Arc
Dr. Donald Westphall is the director of medicine at St. Eligius and the moral center of the hospital, a widowed father raising two children while shouldering responsibility for the institution and the people who work in it. Principled, compassionate, and frequently exhausted, Westphall serves as a steady counterweight to the chaos around him, mentoring residents, defending his staff against budget-minded administrators, and trying to keep the struggling hospital functioning without losing sight of its patients.
Much of Westphall's story is defined by the tension between his idealism and the institutional and financial pressures bearing down on St. Eligius. He clashes with administrators over priorities and ethics, navigates the demands of running a teaching hospital, and balances his leadership role with the challenges of single parenthood, including caring for his son Tommy, who is autistic. His relationships with colleagues, especially the prickly surgeon Mark Craig, form a recurring source of both friction and deep mutual respect.
Westphall's principled stands occasionally put him at odds with the hospital's corporate direction, leading to one of the series' more memorable acts of defiance against new management. As one of the central figures across the show's run, he embodies its recurring themes about the cost of caring within a flawed system. He is also tied to the series' famous closing image, in which his son Tommy holds the snow globe that frames the finale's reality-questioning twist.