After completing his doctorate, Witten went to Harvard where he was postdoctoral fellow during session 1976-77 and then a Junior Fellow from 1977 to 1980.
Pagkatapos ng kanyang titulo ng doktor, Witten napunta sa Harvard kung saan siya ay postdoctoral kapwa sa panahon ng session 1976-77 at pagkatapos ay isang Junior Fellow 1977-1980.