A Boston area native, Ellis started in theatre as a kid in the pre-Broadway cast of ''James & the Giant Peach'' by Tony winners Benj Pasek / Justin Paul & Timothy McDonald, dir. by Tony-winner Graciela Danielle, alternating the title role at Goodspeed Musicals. Following this, he joined the cast of ''Dani Girl" by Michael Kooman / Chris Dimond at NYC's Cherry Lane Theatre dir. by Scott Schwartz, won the "Best Performance by a Young Actor" IRNE Award for ''The King & I'' at North Shore Music Theatre dir. 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 the world premiere of Sue Kossoff & Jane Staab's "The Secret Garden" in Boston. He was part of the 4-person revue at the Town Hall ''Welcome to NYC” with Tony winner LaChanze, nominee Robert Cuccioli, & Bailey Grey & became known as Seth Rudetsky’s "kid who belts big" on SiriusXM. He was also an established boy soprano in the opera world, performing & recording pieces by Tony winner Stephen Schwartz & Emmy winner Glen Roven for the Metropolitan Opera & NYC Opera’s featured contemporary works, & interpreting iconic treble roles for GPR Opera NYC & Boston Lyric Opera. Other child stage credits include York Theatre NYC, American Theatre for Actors NYC, NYMF, Huntington Theatre, & Passage Theatre.

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

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After high school, Ellis joined the US tour of "The FlyBoys" (as seen on Britain's Got Talent) with the Glenn Miller Orchestra. He went on to lead the star-studded cast of the renowned world premiere of "Far From Canterbury'' at The Barnstormers Theatre, toured internationally playing Gabe in Tom Kitt / Brian Yorkey & Michael Greif’s Tony & Pulitzer-winning "Next To Normal," originating the role in Taiwan, & garnered rave reviews as Jack in Terrence Nolen, Billy Bustamante, & Ryan Touhey's production of "Into The Woods" (Philadelphia theatre award-nominated) at the Arden Theatre. Last year, he appeared in & dance captained the original off-Broadway production of "White Rose." He has been seen 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 / Olney Theatre Center, & "Runaway Home" opposite Oscar nominee Abigail Breslin & 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. Other recent stage credits include Signature Theatre NYC, The Shed NYC, Bay Street Theatre, Gateway Playhouse, Prospect Musicals NYC, & Queens Theatre NYC.

Outside of theatre, Ellis is a Jazz singer, arranger, & recording artist, with solo performance experience locally & internationally, known for his Sinatra-like crooner voice. He has experience in film/TV & voiceover.

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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 2024. He is active in community & equity work & has been a leader for organizations such as Theatre Industry Political Action Community & National Asian Artists Project. He is a proud eating disorder recovery influencer with a TikTok following & NPR appearances. His greater goal in being in the entertainment industry is to create change & cultivate frequently ignored conversations around beauty standards & appearance discrimination.