He acted badly towards his former Teacher Edmund Husserl who was sacked from his post as he was partly Jewish.
In 1967 Heidegger met with the Jewish poet Paul Celan, a concentration camp survivor. Celan visited Heidegger at his country retreat and wrote an enigmatic poem about the meeting, which some interpret as Celan’s wish for Heidegger to apologize for his behavior during the Nazi era.[112]
How my heart sings 