Cast of ER Cast of ER "ER" is an American drama series that aired on NBC from September 19, 1994 until April 2, 2009. The series featured a large ensemble cast that changed dramatically over its long run. The main cast was augmented by a wealth of recurring characters and award-winning guest stars. The original starring cast consisted of Anthony Edwards as Dr. Mark Greene, George Clooney as Dr. Douglas "Doug" Ross, Sherry Stringfield as Dr. Susan Lewis, Noah Wyle as medical student (later Dr.) John Carter, and Eriq La Salle as Dr. Peter Benton. Julianna Margulies guest starred in the pilot as
Everest ER the clinic, a corporate sponsor (Medcor, Inc.) created and continues to manage the website and production companies filmed documentaries about the clinic in 2004, 2006, and 2007, which increased exposure to potential sponsors. The Everest ER has been well received and relied upon by more teams in the subsequent seasons – in the first 9 seasons the clinic logged over 2500 patient visits. Everest ER The Everest ER is a seasonal tent-based medical clinic at the Everest base camp (17,600 ft/5350m) founded in 2003 by Dr. Luanne Freer, a volunteer physician for the nonprofit Himalayan Rescue Association (HRA) in Nepal