Rosen attended Sanford H. Calhoun High School in Merrick, New York, and was an All-State vocal jazz singer as well as an All-County baseball player.

[3] During Rosen's junior year of high school, he auditioned for American Idol in East Rutherford, New Jersey, and advanced to Hollywood Week.

After his time on Idol, Rosen attended Hofstra University and graduated summa cum laude with a BS in Jazz & Commercial Music in 2016.

[4][5] In 2015, Rosen composed the original song “Blue and Gold” during his junior year at Hofstra University.

In June 2015, Rosen opened for Shawn Mendes during a sold-out show at The Paramount in Huntington, New York.