It is a talk given to the Oxford Transhumanists. Their previous speaker was Eliezer Yudkowsky.
To clarify what I originally misinterpreted on reading this description: according to this page, Yudkowsky was giving a talk on 25 Jan 2011, while Deutsch on 10 Mar 2011, so “previous speaker” doesn’t refer to giving talks in succession.
To clarify what I originally misinterpreted on reading this description: according to this page, Yudkowsky was giving a talk on 25 Jan 2011, while Deutsch on 10 Mar 2011, so “previous speaker” doesn’t refer to giving talks in succession.