I have just returned from the ISMP conference, where Paul Tseng, a mathematics professor at the University of Washington in Seattle and MIT graduate, for whom I worked as a Teaching Assistant back in the Fall of 2002 when he was on sabbatical at MIT, was scheduled to give a semi-plenary talk on Tuesday. The conference committee has been publishing daily newsletters for the duration of the conference, and here is an excerpt from today's newsletter (also see this article dated August 25 from the Seattle Times, which provides similar information):
"Paul Tseng's Whereabouts Still Unknown.
The University of Washington has issued the following press release concerning Paul Tseng:
"University of Washington mathematics professor Paul Tseng has been missing since August 13 in a scenic mountainous region in Yunnan Province, China. Tseng was invited to China to participate in [a conference.] Prior to his appearance at the conference, Tseng, an avid outdoorsman and experienced kayaker, planned a kayaking trip on the Jinsha river. When he failed to appear for his presentation, conference organizers notified the local authorities in Lijiang. [...] Tseng was seen entering the Jinsha river August 13 near Jinganqiao, but there has been no contact with him since and his whereabouts remain unknown."
[...] Paul's many colleagues and friends at ISMP are distressed by his absence and he remains very much in our thoughts as we wait and hope for good news."