On the Nickelodeon television series iCarly, Rowley (as the character Lewbert) plays a mean and nasty doorman of Bushwell Plaza, where Carly, Freddie, and Spencer all live.

On the show, Lewbert is recognized for having excessive anger outbursts (i.e., when people walk all over the floor he just mopped).

Rowley has also appeared on The Amanda Show, most notably the sketch called "Blockblister" (a parody of the video retail chain Blockbuster), where he plays a customer angered by the film he rented.

Rowley is a member of the improvisational and sketch comedy group called The Groundlings, based in Los Angeles, California.

[3] In 2019, Rowley worked as a writer and voice actor in the Fox series Bless the Harts, where he portrayed Jimmy Lee and Mayor Webb, with the latter role being recast in later episodes to Jon Hamm.