Computational Systems Group Staff

Jim Craw has over 20 years of experience in large-scale computing, with 17 of those years working in the high performance scientific computing field at NASA, DOE and in the petroleum industry. In addition, he has over 14 years of management experience that has included responsibilities for managing complex and large technical groups, HPC procurements and source evaluation, technical contract management, user interface/liaison, 24 x 7 operations, and customer/client services management. Jim received his B.S. in business administration and management information systems from California State University, Chico.

Tina Butler is responsible for evaluating and recommending the direction and implementation of technology at NERSC, as well as performing ongoing system administration and support for the center's systems. Over the last 20 years, she held a variety of systems and applications programming and support positions in high performance and technical computing at DOE, DOD, NASA, and US EPA installations. She also acted as chief technologist at US EPA's National Environmental Supercomputing Center. Tina earned a B.A. in Anthropology at Northwestern University.

Nick Cardo is the IBM SP project lead. His previous experience includes system programmer and system analyst at NASA Ames Research Center and John von Neumann National Supercomputer Center in Princeton. Nick has developed a wide variety of utilities, kernel modifications, and algorithms for high performance systems, including one of the first full-production schedulers for the Portable Batch System (PBS). Nick earned a B.S. in Computer Science at the New Jersey Institute of Technology and an M.S. in Computer Engineering at San Jose State University.

Tina Declerck recently retruned to the NERSC’s Computational Systems Group after working there from 1997 through 2001. In her previous tenure at NERSC she managed the PDSF and Cray J90 SV1 clusters. During her hiatus, she worked at Sistina Software, the company that developed the Global File System (GFS) and was later bought by Red Hat. At Sistina, Tina was in charge of growing and managing the customer support team. At 3Ware, which manufactures SATA RAID controllers, she defined new product features, acted as the primary interface between the field support and engineering teams, provided technical training to resellers, and worked on I/O performance and tuning. Now back at NERSC, Tina is the system lead for the SGI Altix named DaVinci, and she provides secondary support on Franklin, the Cray XT4.

Before joining NERSC, Wendy Lin worked at Purdue University for 20 plus years as a systems programmer, supporting HPC systems such as Cyber 205, ETA 10P*, Intel Paragon, and IBM SP. She was also involved in large development projects such as checkpoint/restart and batch job scheduling. She was a member of the Purdue TeraGrid team, made the IBM SP resource available to TeraGrid users, and helped build the nanoHUB science gateway. Wendy holds a Master's Degree in Computer Science from the University of Nebraska.

Iwona Sakrejda earned her Ph.D in particle physics from the Institute of Nuclear Physics in Krakow, Poland. She worked at CERN, BNL and LBNL with several relativistic heavy ion experiments specializing in event reconstruction and gaining experience in a variety of programming languages (FORTRAN, c, C++), operating systems, visualization for HENP experiments, and user support. For five years before joining NERSC, Iwona led a team that wrote the core software for the STAR TPC, one of the largest detectors looking for quark-gluon plasma at the Relativistic Heavy Ion Collider at BNL.

Jay Srinivasan is the PDSF system lead. Jay earned his Ph.D. in chemical physics from the University of Minnesota in 1999 and became interested in high-performance computing while doing his graduate work. He worked at the Minnesota Supercomputing Institute before coming to Berkeley Lab.