Seth Yalcin is an Assistant Professor of Philosophy at the University of California, Berkeley, where he is also a member of the Group in Logic and the Methodology of Science. Prior to that he was an Assistant Professor of Philosophy at New York University. He holds a PhD in philosophy from the Massachusetts Institute of Technology. He works mostly in the philosophy of language, on descriptive and foundational issues in natural language semantics. Lately his work has borrowed ideas from formal epistemology and from metaethical expressivism to develop accounts of the meaning of epistemic and deontic modals, probability operators, conditionals, attitude verbs, and the language of spatial orientation. He also has research interests in metaphysics, on questions about the nature of modality, information, and randomness. This podcast is an audio recording of Dr. Yalcin's talk - "Bayesian Expressivism" - at the Aristotelian Society on 9 January 2012. The recording was produced by Backdoor Broadcasting Company in conjunction with the Institute of Philosophy, University of London.