Jack has appeared in over 60 feature films, including Men in Black II. One of his most memorable performances was in film Love Liza as Denny, an energetic radio control hobbyist trying to help Philip Seymour Hoffman's character come to terms with the suicide of his wife. He also had a brief but memorable role in The Big Lebowski as The Dude's (Jeff Bridges) landlord.

He guest starred in the Star Trek: Deep Space Nine episode "Babel", and in the Angel episode "Long Day's Journey". In 1995 he played Mr. Chase in the Babylon 5 episode "Comes the Inquisitor".

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杰克出演了 60 多部故事片，包括《黑衣人 II》。他最令人难忘的表演之一是在电影《爱丽莎》中饰演丹尼，他是一位精力充沛的无线电控制爱好者，试图帮助菲利普·西摩·霍夫曼的角色接受妻子的自杀。他还在《The Big Lebowski》中扮演了一个短暂但令人难忘的角色，饰演 The Dude's （Jeff Bridges） 的房东。

他客串出演了《星际迷航：深空九号》剧集《通天塔》和《天使》剧集《漫长的一天之旅》。1995年，他在《巴比伦5》的“审判官来了”中扮演蔡斯先生。