I am sorry to see that Harry Frankfurt has died.
He was a emeritus professor of philosophy at Princeton University, but most of us probably knows him from his impactful book On Bullshit. It was originally printed in Raritan, volume 06 number 2, Fall 1986 from the Rutgers School of Arts and Sciences.
On Bullshit is a slim volume, and brings a core message about the role of bullshit, as distinct from lies, in the modern discourse. In many ways, it addressed the current QANON, Trump and the GOP long before they became what they are now.
For more, see the obit at the NY Times: Harry G. Frankfurt, Philosopher With a Surprise Best Seller, Dies at 94