Office hours are Tuesday-Friday, 1:30-2:50, Philadelphia time (usually GMT-5, although evidently it can sometimes vary, depending on idiosyncrasies of daylight savings times), in McNeil 519 or by phone at +1 (215) 898-1507. I give priority to those physically present and switch the phone to voicemail when in a meeting.
Known days when I am away, with no office hours, are posted here. Additional cancellations/modifications (if any) are listed immediately below.
Additional cancellations/modifications: No office hours December 13.