IPAM mourns the death of a colleague and friend, Peter Smereka.  Peter was a professor of mathematics at the University of Michigan since 1994.  He received his PhD from UCSB and spent three years at UCLA as a postdoc, with Stan Osher and Russ Caflisch as his advisors.  He participated in one of the first IPAM long programs, Mathematics in Nanoscale Science and Engineering (2002).  He returned to IPAM two more times, for Cells and Materials (2006) and Materials Defects (2012), and gave talks at several IPAM workshops.  Peter was wonderfully creative, with an inquisitive mind and a refreshing sense of humor. He worked on a wide variety of problems, ranging from fluid dynamics to materials science, and is considered one of the leading applied and computational mathematicians of his generation.  Read his obituary.