Bill McCune 1953 - 2011 Bill's untimely passing has shocked and saddened his many friends and colleagues in the automated deduction community. Bill grew up in the northeastern part of the U.S. and attended the University of Vermont. He subsequently moved to the Chicago area and got his Ph.D. in Computer Science from Northwestern University in 1984. He worked at Argonne National Laboratory from 1984 until 2006, where he had the title of Senior Computational Logician. Bill left Argonne in 2006 to become a research faculty member at the University of New Mexico in Albuquerque. He would have turned 58 this December. Bill is perhaps best known for his expertise in the design and implementation of automated reasoning programs, including Otter, Prover9 and Mace4. With their wide selection of advanced features, sophisticated strategies and state-of-the-science algorithms and data structures, these programs are recognized both for their power and their performance. Otter, in particular, continues to be used as a benchmark to evaluate other programs. Most importantly, Bill's programs have been used to solve numerous open questions in mathematics and logic and continue to be used by researchers from various disciplines. Bill also was an expert in the application of automated reasoning methods, and he used his programs to solve several open questions; results have appeared in journal publications, conference proceedings and a research monograph. Bill received special recognition for his solution in 1996 to the "Robbins Problem", a challenge problem proposed by the logician Alfred Tarski and worked on (unsuccessfully) by several of Tarski's students. Bill was honored with the Herbrand award in 2000 for distinguished contributions to automated deduction. In addition to his own research, he served on the editorial board of the Journal of Automated Reasoning and on the program committees of several conferences and workshops. He was the program chair for CADE-14 in 1997. While at Argonne, Bill hosted and mentored young researchers who have matured into leading researchers in our field. Bill will be sorely missed but will continue to be remembered for his many contributions.