Maroulis graduated from Ramapo High School in 1993.
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He has appeared in a number of off-Broadway roles from the Conservatory, along with a series of independent films.
After graduating the Conservatory, Maroulis trained as an acting apprentice at the prestigious Williamstown Theatre Festival in the Berkshires of Western Massachusetts and toured in the Broadway international touring company of Rent performing the lead role of Roger Davis. Since he had no agent representing him at that time, he was allowed to appear on American Idol.
The band rose to national attention when Maroulis appeared on Idol.
His audition clip showed him "quitting" the band amongst the displeasure of one of his fellow bandmates, which they have claimed is an inaccurate portrayal.On April 27, 2005, Maroulis was eliminated from American Idol after he performed Nickelback's "How You Remind Me" during the 2000s music round.Less than a week before his elimination, Maroulis's pre-Idol band, Pray For The Soul Of Betty, announced the May 10 release of their self-titled debut on their label, Baby Julius.He was in the cast recording of the 2000 musical, Suburban Dreams, which was produced by composer Stephen Thompson, Richard Kenner, and Jesse Merz.Some years before appearing on American Idol, Maroulis competed on the dating show Elimidate and was an extra in NBC's Law and Order: SVU as well as performing as a voice-over artist on the Kids WB series Astro Boy.Maroulis was featured on the American Idol Season 4: The Showstoppers compilation with "My Funny Valentine".