Bits and pieces
Video of 'The Great Unifier: Form and the Unity of the Organism', delivered at Senate House, London, June 2016.
Audio of talk 'Appearance and Reality: What Plato Can Teach Journalists and the Media', Christ Church College, Oxford, Feb. 2010. The talk is 1 hr 26 min., including Q&A. mp3 (80 mb); wma (40 mb). For the text of the talk, see here.
Audio of talk 'Why Peter Singer is Wrong', with accompanying Powerpoint slideshow, delivered at Princeton on 6 Dec. 2006. The text of the talk is available from me by email. (audio file is 44 mb; 1 hr 33 min.)
Video of a lecture, followed by Q&A, on 'The Metaphysical Foundations of Natural Law' (delivered at the Catholic University of America, Washington D.C., Sept. 2005. Both files are .wmv and can be played on Windows Media Player; lecture is 1 hr 16 min., Q&A is 53 min.)