- Inspired by Mark Hamill's Joker in Batman: The Animated Series (1992) and other DC animated productions for his Joker-like role as Jerome Valeska in Gotham (2014). Hamill himself praised Monaghan's performance on Twitter.
- He stated in a 2017 interview that he never auditioned for the role of Jerome Valeska on 'Gotham'. Instead, he was contacted and offered the role by the producers. Prior to this he had been in a 2009 episode of 'The Mentalist', which was also created by 'Gotham' show runner Bruno Heller.
- To get into character for his villainous role as Jerome Valeska on "Gotham," Cameron Monaghan created a "schizophrenic" 50-song playlist that included everything from "Don't Worry, Be Happy" to Norwegian death metal.
- Cameron Monaghan's performance as Jerome Valeska on "Gotham" earned him a 2016 Teen Choice Award nomination in Choice TV Villain category.
- Cameron Monaghan, who plays Ian Gallagher, has received four Young Artist Award nominations in the course of his career, including a win in 2005 for his role as a special needs student in "Malcolm in the Middle."
- A movie that Cameron Monaghan thinks every actor should see is "The Last Detail" (1973) starring Jack Nicholson. "The story is so human that you can just relate and not care about where the story's going. There's something magical about that that every actor should try to achieve."
- Among the special skills listed on Cameron Monaghan's resume are horseback riding, martial arts, acrobatics and guitar playing.
- Five months prior to auditioning for The Music Man (2003), he went to see The Music Man in Ft. Lauderdale when the stage show was on its National tour. He enjoyed the show immensely and was singing "Gary Indiana" on the way home from the show. Two months later for Christmas, he received The Music Man DVD and the movie soundtrack on CD as gifts. He loved Ron Howard as Winthrop & immediately was drawn to this character. He learned all the songs on the soundtrack because he enjoyed listening to the CD so much. And then at the beginning of March, he got a call to audition for The Music Man.
- For his performance as Ian Gallagher in season five, Cameron Monaghan received a Critics Choice Award nomination for Best Supporting Actor in a Comedy Series.
- At age nine, Cameron Monaghan co-starred in the 2003 TV remake of the popular musical "The Music Man" opposite Matthew Broderick and Kristen Chenoweth.
- His character of Jerome Valeska in Gotham (2014) was described as a "proto-Joker" by series creator Bruno Heller.
- On his mother's side, he has Polish and Irish ancestry.
- Cameron Monaghan began his show business career at an early age, appearing on his first catalogue cover at age five and his first commercial at age seven.
- In 2016, Cameron Monaghan co-starred in season one of PBS's Civil War medical drama series "Mercy Street" for executive producer Ridley Scott.
- As a teenager, Cameron Monaghan appeared as one of the title characters in two films based on the popular book series "The Three Investigators."
- In addition to his role as Ian Gallagher in "Shameless," Cameron Monaghan also plays the Joker-like twins Jerome and Jeremiah Valeska on Fox's Batman-themed series "Gotham."
- Cameron Monaghan began acting in elementary school stage productions of such shows as "Stuart Little," "Winnie-the-Pooh" and an adaptation of "The Nightmare Before Christmas."
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