Brian is a native of Long Island New York. He debuted on Broadway in the role of Gavroche in the 2006 revival of Les Miserables and
originated the role of Flounder in the Broadway production of Disney's The Little Mermaid. (Brian can be heard on the original Broadway cast album of The Little Mermaid.) Brian's greatest passion is for rock & roll. He is a multi-instrumentalist, singer/songwriter, and arranger. He often collaborates with his brother, Michael D'Addario, who is also a musician/actor. The brothers started a band at the ages of 6 and 8, and have been performing music ever since. They formed the alternative rock group "The Lemon Twigs" in 2014. After signing with independent label 4AD, "The Lemon Twigs" released their debut album, "Do Hollywood" in October 2016. They toured in the US, Europe, Australia, and Japan and released an EP ("Brothers of Destruction") in September 2017. Their second album, "Go to School," came in early in 2017 and #3, "Songs for the General Public," in 2020. A fourth album is in the works for release in 2022.