He was best known to the general public as a young math expert on the radio and television show Quiz Kids.
The 1944 film Chip Off the Old Block, starring Donald O'Connor, Peggy Ryan and Ann Blyth, featured Kupperman as the "Quiz Kid", representative of the group.
[2] During his initial Quiz Kids shows, Kupperman, who was then 7, lisped, which emphasized his youth and endeared him to the listening audience.
He developed an interest in Asian philosophy, through which he found a mentor: a visiting professor who advised him to leave the United States.
[10] In 2018, Simon & Schuster published All the Answers, a graphic memoir by Michael Kupperman on his father Joel's rise to fame and his subsequent retreat from public life.