Jack Antonoff is the son of mother Shira and father Rick. Growing up, his father Rick was a business investor while his mother Shira was a nurse.

Shira later left the medical field to raise Jack and his two siblings, Rachel and Sarah, who sadly passed away when she was 13 after battling brain cancer.

His older sister, Racheal is a fashion designer, with Jack and his parents often featuring in campaigns showing off her latest clothing collections.

Jack is an American singer, multi-instrumentalist, songwriter and record producer. He is the lead singer of the rock band Bleachers and was a guitarist and drummer in the pool band fun. He was previously the lead singer of the indie rock band Steel Train.