Glantz was raised in Deerfield, Illinois,[3] a suburb of Chicago, Illinois. At the age of 8, Glantz saw his father playing guitar which inspired him to learn as well.[4][3] As a teenager, he joined a band where he also learned how to play bass, piano, and drums.[5] He has two siblings: a younger brother, Brady, and a younger sister, Olivia.[4]
After high school, Glantz went to the University of Pennsylvania for engineering, but dropped out a year later to pursue music more seriously.[4][6] Glantz then moved to Los Angeles to begin songwriting and producing for others and soon after he decided to write songs for himself and to pursue a career as an artist.[7]
Career
Alexander signed to Interscope in 2019.[8] He released his first single "Dirty AF1s" in 2019 which made it to Spotify's New Music Friday playlist and was recognized as Apple Music's "Bop of the Week".[9] After releasing five subsequent singles, his first EP I'm Sorry I Love You was released by Interscope in October 2019.[10]
He made his first live debut opening for Alec Benjamin on his Outrunning Karma Tour in 2019[11] and has since opened for artists such as mxmtoon,[12] Chelsea Cutler,[13] and Omar Apollo.[9] Alexander was set to open for Lauv during his How I'm Feeling Tour in August 2020, however, due to the COVID-19 pandemic these tour dates were cancelled.[14] Alexander instantly sold out his first two headline shows in Los Angeles in February 2020.[15]
When describing his decision to go by Alexander 23, Alexander said, "I was born on the 23rd, I grew up in Chicago and saw Michael Jordan as a huge figure in basketball and was obsessed with him, and he wore number 23. Plus, I was 23 when I started writing these songs. I knew that I wanted to go by my real first name and I just thought I'd spice it up by adding number 23 at the end."[6]
Alexander is also a member of the ten-member band Top Bunk.[16]
His second EP, Oh No, Not Again! was released on February 19, 2021, on Interscope Records.[17]
In the spring of 2022, Alexander joined John Mayer as the opening act on his Sob Rock tour.[19]
Alexander released his debut album "Aftershock" in July 2022 which had no features but contained the lead single "Hate Me If It Helps" which was co-written by Olivia Rodrigo, "The Hardest Part" which featured background vocals from Chappell Roan and "RIP You and Me" which includes an outro piano solo from Charlie Puth.[20]
In January 2023, he collaborated with famed Japanese designer Hiroshi Fujiwara for the single art on his song "How To Drive".
Alexander served as the executive producer for Reneé Rapp's debut album Snow Angel which was released in August 2023.
Alexander produced and co-wrote every song on Jake Shane's comedy album Puss & Poems which was released November 22, 2024 and went to #1 on the Itunes Comedy Charts.
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