The very excellent Eugene Heath in Metaphilosophy.
Philosophy should not be immured within the confines of the university but should step confidently into the communal spaces of society. Philosophy should include, in other words, public philosophy. What, however, is public philosophy? And is it an unalloyed good? These questions are the subject of this essay.
Speaking of public philosophy, happy 89th birthday to Bryan Magee, public philosopher par excellence! Here is a write-up on Bryan from 2003 in The Guardian.