Daniel S. Katz is Chief Scientist at the National Center for Supercomputing Applications (NCSA) and Research Associate Professor in Computer Science, Electrical and Computer Engineering, and the School of Information Sciences (iSchool) at the University of Illinois Urbana-Champaign. He was previously a Senior Fellow in the Computation Institute (CI) at the University of Chicago and Argonne National Laboratory, a Program Director in the Division of Advanced Cyberinfrastructure at the National Science Foundation, Director for Cyberinfrastructure Development at the Center for Computation & Technology (CCT), Louisiana State University, Principal Member of the Information Systems and Computer Science Staff and Supervisor of the Parallel Applications Technologies group at the Jet Propulsion Laboratory, and a Computational Scientist at Cray Research. Dan’s interest is in the development and use of advanced cyberinfrastructure to solve challenging problems at multiple scales. His technical research interests are in applications, algorithms, fault tolerance, and programming in parallel and distributed computing, including HPC, Grid, Cloud, etc. He is also interested in policy issues, including citation and credit mechanisms and practices associated with software and data, organization and community practices for collaboration, and career paths for computing researchers. He is a senior member of the IEEE and ACM, and a founding editor and current Associate Editor-in-Chief of the Journal of Open Source Software.