The 2005 Joyner Lecturer was C. Allin Cornell. Allin is best known for original and continuing work on probabilistic seismic hazard analysis (PSHA), now recognized for its great power in synthesizing earth-sciences data, models, and uncertainties in probabilistic portrayals. He is a member of the National Academy of Engineering. He is past President of the SSA (1989-1990) and received the Medal of the Seismological Society, now the Harry Fielding Reid Medal, in 2003. Allin has also been the EERI Distinguished lecturer (1999) and received the Housner Medal from EERI in 2003. Allin presented his Joyner Lecture, entitled “Quantifying the Seismology-Engineering Interface” at the EERI meeting in February, 2005, and at the SSA meeting in April, 2005.