Telly was involved in the development of Broadway's ALLEGIANCE, creating the role of "Sammy" alongside Lea Salonga (MISS SAIGON) and George Takei (STAR TREK). ALLEGIANCE is the story of one Japanese-American family's struggles and triumphs during the Japanese Internment of World War II. The musical made its sold-out world premiere at the Old Globe Theater in San Diego in 2012 and premiered on Broadway in the Fall of 2015. He received critical aceeclaim for his "star turn" (NBC-NY) as Sammy, performed with "breakout power" (Newsday), with Rex Reed of the NY Observer praising his portrayal of Sammy as "beautifully played and powerfully sung by handsome and awesomely talented Telly Leung."
In 2016, Telly starred opposite Justin Guarini (American Idol) in IN TRANSIT, Broadway's first a cappella musical with music by Oscar-winner Kristen Anderson-Lopez, Russell Kaplan, Sara Wordsworth and James-Allen Ford, with direction and choreography by Tony-Award Winner Kathleen Marshall. In June 2017, Telly Leung began his star turn as the title character in Disney’s ALADDIN on Broadway. He would continue to play the role for two years, and his caricature would eventually earn a coveted spot on the wall’s of New York’s historic Sardi’s restaurant. Telly has performed live all over the world. Notable venues include Carnegie Hall, the Kennedy Center, the Hollywood Bowl, the Baltimore Symphony, the St. Louis MUNY, The Shakespeare Theater (DC), Pittsburgh CLO, Paper Mill Playhouse, Dallas Theater Center, Philadelphia Theater Company, Sacramento Music Circus, the Old Globe, Fords Theater, North Carolina Theater, Four Seasons Theater, North Shore Music Theater, The Coterie in Los Angeles, The Magic Castle, NYC's Feinstein's / 54 Below, Birdland Jazz Club, and London's Hippodrome. Telly has appeared on television in GLEE (as Wes of the Dalton Academy Warblers), INSTINCT (CBS), ODD MOM OUT (Bravo), DEADBEAT (on Hulu), LAW AND ORDER: CRIMINAL INTENT and played Kevin in the pilot of ABC's performing arts drama, LIMELIGHT. He was also heavily featured in the PBS documentary BROADWAY OR BUST as a teacher and performance coach for the Jimmy Awards.