Yes, Franz Werfel was Jewish. He was born in Prague to a Jewish family, and he remained a practicing Jew throughout his life. He was a prominent writer and poet, and his work often dealt with themes of Jewish identity and experience. Werfel was married to Alma Mahler, the widow of Gustav Mahler, and they had two children together.
Unveiling Alma Mahler: A Quiz on the Life and Legacy of Austria's Multi-Talented Socialite