John Levesque works in the Chief Technology Office at Cray Inc. where he is responsible for application performance on Cray’s HPC systems. He is also the director of Crays Supercomputing Center of Excellence for the Trinity System installed at Los Alamos Scientific Laboratory the end of 2016. Prior to Trinity, he was director of the Center of Excellence at the Oak Ridge National Laboratory (ORNL). ORNL installed a 27 Petaflop Cray XK6 system, Titan, which was the fastest computer in the world according to the Top 500 list in 2012; and a 2.7 Petaflop Cray XT4, Jaguar which was number one in 2009. For the past 50 years, Mr. Levesque has optimized scientific application programs for success- ful HPC systems. He is an expert in application tuning and compiler analysis of scientific applications. He has written two previous books, on optimization for the Cray 1 in 1989 and on optimization for multicore MPP systems in 2010.

​Mr. Levesque resides in lake-rich Knoxville, Tennessee with his wife of 50 years and labradoodle, Yankee.  He enjoys fishing, visiting grandkids on the West Coast, walking the rolling hills of Knoxville, playing Scrabble and travelling with his wife.  Mr. Levesque is also an avid fan of Settlers of Catan.