Last week, on December 27th, Michael Dummett passed away. Dummett was an important and influential British philosophy of the 20th century, probably most famous for his interpretations of Frege. Indeed it was his early work which helped to revitalize an interest in Frege's work in the second half of the 20th century. (The PEL episode on Frege can be found here. An interview of Dummett talking about Frege on Philosophy Bites can be found here.)
Dummett was also important for his work in the philosophy of mathematics, logic, language, and metaphysics. His most original work involved the suggestion that we understand disputes in metaphysics over realism as disputes in logic. This turns on the principle of bivalence (the semantic principle which says that every statement is either true or false). Insofar as realists think that entities are mind-independent, they will accept bivalence. Truth is conceived as transcending our abilities to know. Anti-realists on the other hand don't accept bivalence since they think that the entities in question are mind-dependent. They take truth to be epistemologically constrained.
There are unfortunately not a lot of videos of Dummett on the web, but if you want to join the Bodleian Philosophy Faculty Library, you can get a long interview of Dummett by Donald Davidson here. Dummett was undoubtedly a significant philosopher of the 20th century. And he will surely be remembered for many years to come.