Terrestrial (1982)_ (qv) literally back to back.  Principal photography on Poltergeist ended in August of 1981, then  Spielberg took a few weeks off and began work on E.T. Spielberg also  supervised the visual effects for both films simultaneously (which  were produced at Industrial Light & Magic under the supervision of  Richard Edlund (qv) and Dennis Muren (qv)). Once post production  work on Poltergeist began in early 1982, Spielberg was in total  control. He was responsible for the editing of the film (Spielbergs  usual editor Michael Khan edited this film while  Carol Littleton (qv) edited E.T), the final sound mixes and loops,  the supervision of the visual effects, and the selection of  Jerry Goldsmith (qv) as the composer of the score. Poltergeist and  E.T opened to theaters nationwide only a week between each other  during the summer of 1982, Poltergeist on June 4th and E.T. one week  later on June 11th.