News Flashback Friday! Walk Down Hair Memory Lane with George Clooney in Honor of ER's 20th Anniversary By Grace Gavilanes Grace Gavilanes Grace Gavilanes is a NYC-based writer and editor who joined InStyle in 2013. She covers all things entertainment, celebrity, and movies. InStyle's editorial guidelines Published on September 19, 2014 @ 09:04AM Pin Share Tweet Email Photo: NBCU Photo Bank Can you believe ER premiered 20 years ago today? It seems like just yesterday the show, which ran from 1994 to 2009, made its debut. The show introduced us to newcomers Julianna Margulies and George Clooney (above), who played Nurse Carol Hathaway and Dr. Doug Ross in the hit TV series that followed a group of emergency room doctors as they worked at a Chicago hospital. We couldn't help but dig up the above vintage snapshot of Clooney and Margulies on the ER set. Although we tuned in for the drama, most of us stayed for Hollywood's favorite bachelor (now husband-to-be!), who went through a number of hair changes through his career. Click here to see the Oscar winner's best hair moments, from a mullet to a full-grown beard!