Prof. Patricio Anibal Letelier Sotomayor, born in Santiago, Chile, on the 11th September, 1943, passed away due to a cardiac arrest at his home in Campinas, SP, Brazil, on Thursday, June 9, 2011. Prof. Letelier was a highly respected teacher and mentor to an enormous number of people in the country and around the world. He did his undergraduate studies in the University of Chile in the late sixties and obtained his Ph.D. in Physics from Boston University in 1977. He then joined the Department of Physics of the University of Brasilia and, in 1988, he left Brasilia and came to the Department of Applied Mathematics of the University of Campinas as a Professor of Mathematical Physics. Patricio was a beloved friend and colleague, and his passing is a huge loss on many levels. He will be greatly missed and remembered always. He is survived by his wife, daughter, son, and granddaughter.
