From Drew Magazine, a report on the 1964 conference where Hans Jonas denounced Heidegger
The subject of the conference was “The Problem of Non-objectifying Thinking and Speaking in Contemporary Theology.” Heidegger had written a 13-page paper that was read, in absentia, as the first order of business. Jonas then stepped to the lectern to deliver a lecture he had titled simply “Heidegger and Theology.”
It was expected that Jonas would offer praise for the philosophical canon advanced by his revered mentor. He did not.