On August 11 Michael Frede died in Delphi (Greece), where he was attending the Symposium Hellenisticum. A memorial notice from the Berkeley Classics Department is found here.
Frede was a leading specialist in several fields of ancient philosophy, including skepticism. His two most important contributions in this area are "The Sceptic's Beliefs" and "The Sceptic's Two Kinds of Assent and the Question of the Possibility of Knowledge".
Both papers - which have exerted a major influence on the subsequent research on ancient skepticism - can be found in M. Burnyeat and M. Frede (eds.), The Original Sceptics: A Controversy (Hackett: Indianapolis, 1997).