I arrived at Caltech in June 1986,with interests in both mineral physics and seismology.I was excited to either study mineral physics with Professor Tom Ahrens,or investigate great earthquakes with Hiroo Kanamori.Upon arriving,I decided seismology would be my path.I was particularly interested in Hiroo's work on earthquake size,from some papers I read as an undergraduate(Kanamori,1978,1983).In my first week,I met with Hiroo,and he asked me what my plan would be for studying great earthquakes.Well,I had no plan,no clue!He wisely noted that we are in need of more and better seismic data-which of course came during the decade that followed with the digital data explosion.Hiroo suggested I introduce myself to seismologist Don Helmberger next door-maybe he would have some interesting research projects for me to consider.