He is best known for his work on the DC Comics characters Sgt. Rock and Hawkman.
Kubert's other creations include the comic books Tor, Son of Sinbad, and Viking Prince, and, with writer Robin Moore, the comic strip Tales of the Green Beret.
He emigrated to Brooklyn, New York City, United States, at age two months with his parents and his two-and-a-half-year-old sister Ida.
Kubert attended Manhattan's High School of Music and Art.
In the 1950s, he became managing editor of St. John Publications.
Kubert made a return to writing and drawing in 1991 with the Abraham Stone graphic novel Country Mouse, City Rat for Malibu Comics' Platinum Editions. He returned to the character for two more stories, Radix Malorum and The Revolution published by Epic Comics in 1995.
From a village called Ozeryany in what was southern Poland and is now Ukraine.
Kubert was inducted into the Harvey Awards' Jack Kirby Hall of Fame in 1997, and Will Eisner Comic Book Hall of Fame in 1998.