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Horst Simon

Berkeley Lab Deputy Director: Directorate

Jon Weiner, 510-486-4014,

Dan Krotz, 510-486-4019,


Horst Simon is an internationally recognized expert in computer science and applied mathematics and the Deputy Director of Lawrence Berkeley National Laboratory (Berkeley Lab). Simon joined Berkeley Lab in early 1996 as director of the newly formed National Energy Research Scientific Computing Center (NERSC). Under his leadership NERSC enabled important discoveries for research in fields ranging from global climate modeling to astrophysics. Simon was also the founding director of Berkeley Lab's Computational Research Division, which conducts applied research and development in computer science, computational science, and applied mathematics.

Simon’s research interests are in the development of sparse matrix algorithms, algorithms for large-scale eigenvalue problems, and domain decomposition algorithms for unstructured domains for parallel processing. His algorithm research efforts were honored with the 1988 and the 2009 Gordon Bell Prize for parallel processing research. He was also member of the NASA team that developed the NAS Parallel Benchmarks, a widely used standard for evaluating the performance of massively parallel systems. He is co-editor of the biannual TOP500 list that tracks the most powerful supercomputers worldwide, as well as related architecture and technology trends.

He holds an undergraduate degree in mathematics from the Technische Universtät, in Berlin, Germany, and a Ph.D. in Mathematics from the University of California at Berkeley.

Recent Publications

Adaptive Projection Subspace Dimension for the Thick-Restart Lanczos Method
Ichitaro Yamazaki,  Zhaojun Bai,  Horst D. Simon,  Lin-Wang Wang,  Kesheng Wu
ACM Transactions on Mathematical Software - TOMS , vol. 37, no. 3, 2010

The cat is out of the bag: cortical simulations with 109 neurons, 1013 synapses
Rajagopal Ananthanarayanan,  Steven K. Esser,  Horst D. Simon,  Dharmendra S. Modha
Conference: Supercomputing Conference - SC , 2009

Awards and Memberships

ACM Gordon Bell Prize 2009

ACM Gordon Bell Prize 1998

In the News

HPC Wire: Searching for Blue Waters' Replacement
The News Gazette: New vendor possible, but supercomputer could miss 2012 deadline
San Jose Mercury News: Cal computer science dolts root for machine over man on “Jeopardy!”
Wall St. Journal: China supercomputers fuel US competition
Wall St. Journal: Chinese Supercomputer Likely to Prompt Unease in U.S.
San Francisco Business TimesBerkeley Lab taps deputy director China Displays Supercomputing Prowess with World's Fastest Supercomputer
InsideHPC: Introducing Episode 1 of the Green HPC Podcast Series


Ph.D. in Mathematics from the University of California at Berkeley.


last updated: 2011-08-19 13:33:40