Acting career
In the fall of 2005, Maroulis was in negotiations to star in a television sitcom called Brooklyn that was to be loosely based on his upbringing as the youngest of three in a large Greek-American family of New York. ABC bought rights to the show, but passed on the project before it passed the script stage.
Maroulis joined the cast of the Broadway musical The Wedding Singer in the role of Sammy in September 2006. Along with the other cast members, he contributed a recording of the Adam Sandler "Hanukkah Song" to the 8th Carols for a Cure CD to help raise funds for the Broadway Cares/Equity Fights AIDS organization.
Beginning on January 9, 2007, Maroulis took over the role of "Young Soldier" in the Off-Broadway musical revue, Jacques Brel is Alive and Well and Living in Paris where he performed through the end of February. That spring, Maroulis joined the lineup on Good Day New York, serving as the show's resident American Idol expert, while simultaneously taking on the same role as Idol commentator for Yahoo! Buzz. Later that year, Maroulis joined the cast of The Bold and the Beautiful for a limited run as Constantine Parros, a singer and record producer, a role created specially for him.
March 2008 saw Maroulis joining the cast of American Idol Extra as cohost, along with fellow Idol alum Gina Glocksen and J.D. Roberto. His next major role occurred that June, when Constantine starred as Judas Iscariot in the Premier Theatre Company's production of Jesus Christ Superstar. Constantine had previously played the role of Jesus in an earlier production when he was much younger.
Maroulis achieved particular success starring as Drew in the hit Broadway musical Rock of Ages, featuring the music of 1980s rock legends including Journey, Bon Jovi, and Twisted Sister. The production began running Off-Broadway at the New World Stages in October 2008, moving to Broadway to the Brooks Atkinson Theatre on April 7, 2009. Rolling Stone stated that the "play has found a perfect lead in American Idol rocker Constantine Maroulis," while Associated Press added that Maroulis "gives a touching performance and sings powerfully as Drew, the young wannabe rock singer." Maroulis' vocal performances were particularly praised, with The New York Times describing his voice as "soulful, pure, and intense,"
and the Chicago Tribune singling out his "dazzling vocal pyrotechnics" as a standout in the production. On May 5, 2009, Maroulis received a nomination for the Tony Award for Best Performance by a Leading Actor in a Musical. From Broadway, Maroulis headlined the national touring production, with the first show opening in Chicago on September 21, 2010, and his last performance on July 24, 2011 at the National Theatre in Washington, DC. Maroulis had a cameo as a record producer in the film version of Rock of Ages, released in June 2012.
Maroulis was cast as Melvin Ferd the Third, in The Alley Theatre's production of The Toxic Avenger, which performed in Houston, Texas, from January 13, 2012, through February 12, 2012. The Houston Chronicle praised the production as being "brilliant," adding that "[the] casting is nothing short of miraculous" and "Mr. Maroulis' voice is a gorgeous, crystal-clear, unwavering, bright tenor instrument that will blow you away."
In 2012, Maroulis became the host of a new series on Fuse.tv.com, Unofficial Idol Forum. Maroulis interviewed Idol contestants as well as interacted with American Idol fans via social media sites such as Twitter and Facebook, soliciting questions and feedback about each week's Idol broadcast.
In autumn 2012, Maroulis took on the title role(s) in Frank Wildhorn's Jekyll and Hyde, co-starring with Deborah Cox, which arrived on Broadway after a 25-week national tour. Previews for the touring production were held at La Mirada Theatre for the Performing Arts in La Mirada, California, from September 7 to 30, 2012. It opened on Broadway at the New York Marriott Marquis Theater on April 18, 2013, after previews beginning on April 5, with its last performance on 12 May. The New York Times stated that Maroulis meets "[the] challenges of Mr. Wildhorn's score with aplomb" and "I was also impressed by Mr. Maroulis' quietly intense performance as the obsessive Dr. Jekyll." The New York Daily News adds that "[Maroulis] knows how to build drama in a song and makes the familiar "This Is the Moment" fresh. He impresses." For his performance in this dual role, Maroulis received a Drama League Award Nomination for a Distinguished Performance Award.
Maroulis has guest starred on various television programs including Law & Order: Special Victims Unit, Z Rock, Unforgettable, and Madam Secretary, as well as web series such as Mozart in the Jungle and Kittens in a Cage.
On July 23, 2014, it was announced that Maroulis would be returning to Rock of Ages as Drew for a twelve-week engagement at the Helen Hayes Theater beginning August 4, 2014. As of October 21, Maroulis' return was extended to January 18, 2015; the show's final closing date on Broadway.
In 2015, Maroulis was featured in a commercial campaign for La-Z-Boy furniture portraying Brooke Shields's fictional Greek lover.
In spring 2016, Maroulis was cast as Nate in Sofia Alvarez' Friend Art from Second Stage Theatre at the McGinn/Cazale Theater. In March 2017, Maroulis joined The Most Beautiful Room in New York as Sergio, which had its world premiere in May 2017 at Long Wharf Theatre in New Haven, Connecticut. Maroulis portrayed Judas Iscariot in Jesus Christ Superstar for the June 2017 production at The Muny. That summer, Maroulis was cast as Che in Evita at North Shore Music Theatre in Beverly, Massachusetts, running from September 26 through October 8, 2017. Maroulis played Robert Moses in the musical, Bulldozer: The Ballad of Robert Moses in November 2017. Reprising the title role, Maroulis performed in the spring 2018 production of Jekyll and Hyde at the Sandler Center for the Performing Arts in Virginia Beach, Virginia. Maroulis returned to North Shore Music Theatre in autumn 2018, this time again reprising the title role of Jekyll and Hyde.
In 2019, he played The Wolf/Cinderella's Prince in Into the Woods at the Patchogue Theatre.
In 2023, he played Alan Freed in an Off-Broadway production of Rock and Roll Man at the New World Stages from June 3 through November 5.
In 2024, Maroulis starred in East Carson Street at Axelrod Performing Art Center'sBell Theater.