Don Maghrak is a Senior Computer Scientist at the Krell Institute in Ames, Iowa. Don studied Computer Science at the University of Minnesota and has over 26 years experience in high performance computing as a compiler and tool developer. Don started his career at Cray Research as a developer in the Programming Environments group working on compilers, libraries and tools. Continuing at Silicon Graphics, Don worked as a developer on the WorkShop parallel debugger and later as developer of performance tools. While at SGI Don began developing the Open|SpeedShop application performance tool and continues in this capacity today. Don’s research interests include application performance analysis at extreme scale with an emphasis on data reduction techniques. Don has collaborated on papers related to the performance analysis tool Open|SpeedShop and the Component Based Tool Framework (CBTF) which emphasizes reusable components implemented within MRNet (Multicast Reduction Network) .