Originally from the Greater Boston area, Ellis has been a working actor based in NYC since age 10, & in recent years, has begun working also as a playwright & activist.

He began as a child in musical theatre in the original cast of ''James & the Giant Peach'' by Tony winners Benj Pasek / Justin Paul & Timothy Allen McDonald, under Tony-winning director Graciela Danielle, alternating the title role at Goodspeed Musicals. Following this, he played Marty in ''Dani Girl" by Michael Kooman / Chris Dimond, developed at the off-Broadway Cherry Lane Theatre under Scott Schwartz’s direction (one of the first real children to play the role), won the "Best Performance by a Young Actor" IRNE Award for his performance in ''The King & I'' at North Shore Music Theatre directed by Richard Stafford, appeared in Tony-winner Phyllis Newman’s adaptation of her late husband (Adolph Green)'s "Peter Pan" for American Opera Project, & gained critical acclaim leading Steve Marzullo’s off-Broadway "Rumpelstiltskin" musical as well as Sue Kossoff & Jane Staab's version of "The Secret Garden" which had a tryout run in Boston. After playing opposite Tony winner LaChanze & nominee Robert Cuccioli in a 4-person revue at the Town Hall titled ''Welcome to NYC,” he became known as Seth Rudetsky’s "kid who belts big" on Sirius XM & became established in the opera world as a boy soprano, singing & recording introducing new material by Tony winner Stephen Schwartz & Emmy winner Glen Roven for the Metropolitan Opera & NYC Opera’s featured contemporary works, & also interpreting iconic roles for GPR Opera New York & Boston Lyric Opera. Other early stage credits include York Theatre, American Theatre for Actors, NYMF, Huntington Theatre, & Passage Theatre,. He gained a few small on-camera credits for major studios like Paramount, Columbia, NBC, & CBS.

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Ellis attended St. Mark’s High School where he made Independent School League history by single-handedly creating the institution’s first Musical Theatre program in 20 years (employing crowdfunding within the school community to license & produce shows). It is now part of the curriculum. 

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As an adult, Ellis first joined the US tour of "The FlyBoys" (as seen on Britain's Got Talent) with the Glenn Miller Orchestra. He then led the star-studded cast of the renowned world premiere of "Far From Canterbury'' at The Barnstormers Theatre, garnered rave reviews as Jack in Terrence J. Nolen, Billy Bustamante, & Ryan Touhey's production of "Into The Woods" (Philadelphia theatre award nominated) at the Arden Theatre, & appeared in workshop stagings of “Noble Family” directed by 2-time Tony winner Richard Maltby, "Little Miss Perfect" by Joriah Kwame directed by Zhailon Levingston for Goodspeed Musicals / Olney Theatre Center, & "Runaway Home" opposite Oscar nominee Abigail Breslin & TV star Melissa Gilbert, as well as in readings of "The Gospel According To Heather" by Tony nominee Paul Gordon, "Kill The Boy Band" by Kait Kerrigan, Bree Lowdermilk, & Jihae Park, & “Radio Galaxy” directed by David Esbjornson. Last year, Ellis played Gabe in the original Taiwan cast of Tom Kitt / Brian Yorkey & Michael Greif’s Tony & Pulitzer-winning "Next To Normal" under Broadway Asia at the National Taichung Theater, praised by audiences for his bold re-interpretation of the character (he will be returning to the production for its archiving - one week only: 2025/04/15-20). This year, he appeared in the original off-Broadway cast of "White Rose,” understudying notable Broadway / film / television stars & serving as dance captain. Other adult stage credits include Kennedy Center, Signature Theatre NYC, The Shed NYC, Bay Street Theatre, Prospect Musicals, & Queens Theatre. Outside of theatre, Ellis is an experienced Jazz singer, arranger, & recording artist, with solo performance experience locally & internationally, known for his Sinatra-like crooner voice.

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In addition to performing, Ellis co-wrote "Measure Up," a musical fairytale loosely about eating disorders with EMMY-winning composer Sean P. Pallatroni, commissioned by A Class Act NY, debuted by their youth/college students in the summer of 2024. He is active in community & equity work  & has been a leader for organizations such as the Theatre Industry Political Action Community & National Asian Artists Project. He is a proud eating disorder recovery influencer with a sizeable TikTok following. His greater goal in being in the entertainment industry is to create change & cultivate frequently ignored conversations around beauty standards & appearance discrimination.