赛德勒出生于纽约州的水牛城，很小的时候就在观众前表演弦乐。在Orchard Park读高中时取得了成功，他扮演了一个叫做班卓·比尔·赛德勒的角色，一个演奏班卓琴的歌手，他还能在演奏的过程里说些笑话，学生和教师都非常喜欢他的表演，于是在英文老师Dan Larkin的劝说下，赛德勒参加了高年级...
Dynamically entertaining heavyset US actor with piercing eyes, William Forsythe has a superb talent for playing some truly unlikeable and downright nasty characters that dominate the films in which he appears! If you're cast as the "hero" against Forsythe's "villain", then you have your work cut out for you, as Forsthye's raw energy and menace on screen is second to none. He started out in a couple of minor film roles and guest appearance's in high-rated TV shows including CHiPs (1977), Hill Street Blues (1981) and T.J. Hooker (1982). He quickly moved into high-quality feature films, including playing a small-time hoodlum in Once Upon a Time in America (1984), an hilariously funny performance as a bumbling jail escapee alongside John Goodman in the knockout Raising Arizona (1987) and as a renegade soldier in Extreme Prejudice (1987).
英国演员，曾出演《未来是闪影》、《奥斯丁乐园》、《鲁宾一家重聚》等。
