Alexander Glantz, known professionally as Alexander 23, is an American singer-songwriter and record producer. Since releasing his first string of singles and EP in 2019, he has worked with artists such as Olivia Rodrigo, John Mayer, Selena Gomez, Tate McRae, Charlie Puth, Noah Kahan, Role Model, Jeremy Zucker, Kenny Beats and mxmtoon, and has accumulated hundreds of millions of streams on Spotify on his own music.