Mooney was born in San Diego, California to parents Brian Mooney and Linda Kozub. He graduated from Scripps Ranch High School in 2003 where he won Best Actor as Prospero in Shakespeare's The Tempest. Mooney attended the University of Southern California and majored in Film. He performed improv and sketch comedy with collegiate group Commedus Interruptus. In 2003 the three new members added to Commedus were Kyle Mooney, Beck Bennett, and Nick Rutherford. In 2007 the same three would form the sketch comedy group "Good Neighbor" along with Kyle's best friend, director and editor Dave McCary. Bennett and McCary are joining Mooney on SNL.

毕业于美国西北大学。

　　Seth于2001年加入SNL剧组。2006年1月他成为节目的合作编剧，与大名鼎鼎的Tina Fey和Andrew Steele一同共事。Tina Fey离开剧组后，他成为节目的第一编剧，并与美国喜剧女演员Amy Poehler一同主持新闻版块《Weekend Update》。在Poehler也离开节目组后，他独自负责此板块。

　　在SNL上，Seth模仿过许多名人，包括汤姆克鲁斯、查尔斯王子、全美最性感记者Anderson Cooper、《美国偶像》主持人Ryan Seacrest、奥斯卡影帝西恩潘、艾美获奖编舞Wade Robson、“蜘蛛侠”托比马奎尔、著名美式橄榄球运动员佩顿曼宁、英国男演员迈克尔·凯恩甚至还有扮演《绝望主妇》里Edie的Nicollette Sheridan。

Bennett was born in Wilmette, Illinois, to Andy and Sarah Bennett. He graduated from New Trier High School in 2003 where he played Jean Valjean in his school's production of Les Miserables. Beck attended the University of Southern California in the B.F.A. Acting program. In 2003, he joined the improv/sketch group Commedus Interruptus along with Kyle Mooney and Nick Rutherford. In 2007, after graduation, Mooney, Rutherford, and Bennett joined with editor/director Dave McCary to form the sketch group "Good Neighbor." In September 2013, Bennett and Mooney joined the cast of SNL along with McCary as a director.