You might remember him from his work in front of the camera such as Knocked Up, Ghostbusters, Stripes, and SCTV, but Harold Ramis was more impressive behind the camera.  Whether it was directing, writing, or rewriting the script, his creative genius made Stripes, Animal House, Groundhog Day, Caddyshack, Vacation, and Ghostbusters, the classics they are today.

http://io9.com/r-i-p-harold-ramis-the-man-who-gave-us-ghostbusters-a-1529839951