William Swift
Key information
Gender Male
Hair Color Black
Occupation Physician
Specialty Emergency Medicine
Behind the scenes
Portrayer: Michael Ironside
Episode 7
First episode Full Moon, Saturday Night
Last episode On the Beach

William Swift, known as Wild Willy, is a fictional doctor from the medical drama ER.

He temporary stepped in for David Morgenstern as Chief of Emergency Medicine in the first season. He and Dr. Greene initially do not get along, as Mark is trying to cope with the death of a pregnant patient. Dr. Swift has him present the case at the next Mortality & Morbidity, which ultimately helps Mark through his guilt.

Dr. Swift later appears in the fourth season episode Think Warm Thoughts as a Synergix attending physician.

He then appears in an uncredited cameo for Dr. Greene’s funeral in the eighth season episode On the Beach.