Professor Avraham (Avi) Schiller of the Hebrew University of Jerusalem died of cancer on June 22, 2013. He was 50 years old. Avi received his B. Sc., M. Sc. and Ph. D. degrees from the Hebrew University, graduating in 1993. After postdoctoral positions at the University of Florida and the Ohio State University, he returned to the Hebrew University in 1998, and was a member of its Racah Institute of Physics. Avi made important contributions to the theories of strongly correlated electron systems; the Kondo effect; magnetic impurities away from equilibrium; interacting mesoscopic systems; non-Fermi-liquid behavior and magnetism in heavy-fermion compounds; and the dynamical mean-field theory for correlated electron systems. His research papers are exemplary in their calculational insight, precision and clarity. He collaborated with many physicists all over the world, and they will all feel the loss of his profound intellect, his ability to attack complex questions, and his high standards in research. Avi was also an exceptional teacher. His students fondly remember his ability to impart to them a deep appreciation of physics, through his brilliant organization of the material, his patience in answering questions (both in class and afterwards), his kindness and empathy with every student, and his modest demeanor. He will be remembered by generations of students who both enjoyed and benefitted from the courses he gave over the years. Avi had a keen enthusiasm and love for physics (even above his interest in soccer). Avi was both a family man and an outstanding researcher and teacher.