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Scientific Computing Group, June 2018
Top, left to right: Andrew Wiedlea, Tin Ho, Matthew Li, Connor Williams, Krishna Muriki, Kai Song, Susan James, Jimmy Mai
Bottom, left to right: Erica Yee, John White, Jackie Scoggins, Gary Jung, Karen Fernsler, Zashary Maskus-Lavin, Wendy Avalos

Group Leader

Gary Jung
Gary Jung | GMJung@lbl.gov
Gary Jung is the lead for the Scientific Computing Group at the Lab and is the manager for the High Performance Computing service at UC Berkeley. He has been in the HPC field for over 20 years and started the Scientific Computing Support program at the Lab in 2003 — one of the
first such programs at a large Tier 1 research institution. He also led the effort to launch Lawrencium in 2008, a Top500 list HPC Linux cluster at the time, in order to make institutional HPC available to all Lab researchers. Other projects include a strategic role in the development of the highly successful Berkeley Research Computing program at UC Berkeley in 2014.
Gary holds a bachelor’s degree in Computer Science from San Francisco State University. His hobbies include traveling, cooking and working on HPC (high performance cars).


Jeff D'Ambroglia | JeffD@lbl.gov

Jeff is a Science IT consulting engineer who provides consulting support and services to science and technical programs at the Lab. Prior to joining the Lab, Jeff spent 5 years as the CTO for a national specialty pharmacy company, building the business from the initial founding to the sale of the company. Prior to that Jeff spent over 20 years as an IT consultant working for various startups and established companies in a number of different industries including biotech, e-commerce, healthcare, publishing, and music.

Jeff holds a B.S. in Biology from UC Santa Barbara. His first computing experiences were at the Lawrence Hall of Science playing “Hunt the Wumpus” on a teletype. He enjoys spending time outdoors doing various activities with his family and dog.

Kuldeep Chawla
Kuldeep Chawla | KChawla@lbl.gov

Kuldeep is a Linux systems administrator who recently joined the SCG. He currently manages our new Scientific Virtual Machine service offering and has extensive experience helping people make use of cloud computing. Prior to SCG, he was working in the IT Division's User Support department is a Virtualized Services Engineer. He is a AWS DevOps Certified Professional and VMWare VCP.
An innovator at heart who loves to travel, explore new places, try new cuisines and understand different cultures. When he isn't glued to his digital screens, he love spending time cooking, listening to music and reading.
Kuldeep has a bachelor's degree in Computer Science from Unitec Institute of Technology in Auckland, NZ and is actively pursuing a MBA at Cal State.

Wei Feinstein
Shawfeng "Shaw" Dong | SFD@lbl.gov

Shaw comes to us from SLAC where he was the HPC architect charged with overhauling their HPC infrastructure and services to meet the rapidly changing needs of researchers. Prior to that, Shaw worked for 15 years at UC Santa Cruz where he was the de facto founder of Research Computing and was responsible for a succession of HPC clusters that made the Top500 list of the fastest supercomputers in the world. Shaw was also an adjunct professor of Applied Math at UC Santa Cruz, and taught a popular graduate-level course on High Performance Computing while he was there.

Shaw has a broad interest in science, having published papers in fields as diverse as Astrophysics, Biology, Statistics and Machine Learning.

Shaw holds a B.S. in Space Physics from University of Science and Technology of China, and a Ph.D. in Astronomy and Astrophysics from UC Santa Cruz. In his spare time, Shaw enjoys reading and likes to jog, bike, play squash and badminton.

Shawfeng Dong
Wei Feinstein | WFeinstein@lbl.gov
Wei Feinstein joined the group as an HPC User Services Consultant in 2018. Prior to the Lab, she was an HPC consultant at Louisiana State University, where she assisted faculty, researchers and students from a wide range of scientific disciplines to optimize their simulation workflows, troubleshoot HPC related issues and port codes to computational accelerators. Wei strives to bring cutting-edge HPC technologies to scientific research communities to best facilitate their research endeavors. To this end, she also gives tutorials and workshops that are essential for HPC users, such as parallel programming.

Wei has a research background in computational biology and bioinformatics, and was actively involved in projects such as protein structure modeling and ligand binding site identification.

She holds a master’s degree in Computer Science and a Ph.D. in Medical Sciences. Wei enjoys traveling and watching sports, especially horseback riding.

Karen FernslerKaren Fernsler | KMFernsler@lbl.gov
Karen Fernsler is a HPC Systems Engineer who builds and maintains HPC LInux clusters at the Lab and on the UC Berkeley campus for the Berkeley Research Computing program. In addition to being the group’s Globus expert, she also supports Linux in various flavors for servers and workstations for the ALS and Molecular Foundry national user facilities.
Prior to joining the Lab in 2009, she worked as a Systems Engineer at the National Center for Supercomputing Applications (NCSA) at the University of Illinois. At the NCSA, she was proud to be on the team that deployed Tungsten, one of the largest clusters in existence at the time when it debuted at fourth on the Top 500 in 2003. Karen lives to enable scientists in their pursuit of knowledge.

Karen holds bachelor's degrees in Physics and Computer Science from Knox College in Galesburg, Illinois. She likes to cook, hike, swim, garden, and craft in her free time.

Tin Ho
Tin Ho | tin@lbl.gov

Tin Ho is a HPC Systems Engineer who joined the group in 2017 and was responsible for putting LR5, the latest generation of the Lawrencium cluster, through the acceptance tests and into production. He finds working on the computing system for the GRETA project, a next-generation gamma-ray detector, especially inspiring as it will require using technologies that will last into the 2030s. Prior to coming to the Lab, he worked in the pharmaceutical and software industries.

Tin holds a B.S. and M.S. in Computer Science from Florida International University.

Wei Feinstein
Susan James | SJames@lbl.gov

Susan James is a HPC Systems Engineer specializing in HPC workflow environments to facilitate scientific inquiry and discovery. Since joining the Lab in 1998, she has worked for the IT Division's Conputer Infrastructure Support Group before moving to SCG.

Her 24 years of experience at the Laboratory includes helping researchers architect, deploy, configure, and maintain scientific and high performance computing systems. With her unique set of knowledge, skills, and experience, she not only helps develop innovative solutions to resolve user requirements, but also engages in research and evaluation of new technologies to support the group’s mission of accelerating scientific discovery through high performance computing, data management, and data analysis into the next decade.

Her roots are in Silicon Valley (she grew up in Santa Clara) and her career path led her through various government organizations before she came to the Laboratory. She holds bachelor’s and master’s degrees in Public Health Science from California State University, San Jose.

Fengchen Liu
Fengchen Liu | FengchenLiu@lbl.gov
Fengchen just joined the group as a Science IT Consultant. Prior to joining the Lab, he worked at a Fintech company as a senior AI Engineer, at RMS (Risk Management Solutions) as a Software Engineer, and at UC San Francisco for 7 years on computational epidemiology using HPC. His research background (researchgate.net/profile/fengchen_liu) includes predictive models of infectious diseases and control of epidemic disease through contact investigation.

In his spare time, Fengchen has been working with UCSF on the COVID-19 prediction project using agent-based simulations. He holds a master's degree in Computer Science from Beihang University and was a visiting scholar at UC Berkeley. Fengchen enjoys hiking and tennis in his free time.

Krishna Muriki
Krishna Muriki | KMuriki@lbl.gov

Krishna Muriki leads the HPC User Services effort for both the Lab and the Berkeley Research Computing program on campus. When he’s not overseeing major service rollouts or mentoring interns, he debugs issues with the OS and application stack, as well as helps researchers perform computational work on the SCG’s Linux cluster resources. Before coming to the Lab in 2008, Krishna worked as a HPC User Services Consultant at the San Diego Supercomputer Center.

Krishna holds an undergraduate degree in Electronics and Communications Engineering from a technical university in Hyderabad, India and a master’s in Computer Engineering from Clemson University in South Carolina. He enjoys being outdoors and close to nature, especially while camping with family and friends during the summer.

Goerge Robb III | George@lbl.gov
George Robb is a Computer Systems Engineer working at ESnet as a systems administrator with the infrastructure team. He is part of the team that supports, helps design, and implement the platforms that help ESnet, and the DoE's mission. In addition to ESnet duties, he has been placed on loan and is able to work with this amazing Lab team. Before his arrival at ESnet, George's 19+ year career at the University of Missouri had him happily supporting computer systems, leading a Linux team, constructing and supporting a science DMZ network, along with HPC integrations, support and architecture. When not in a computer terminal George is enjoying family time and playing outdoors in the beautiful Midwest.
George has a passion for seeing research enabled, and science moving forward. A "car" analogy he has been quoted on, when building and tuning HPC systems, is to, "drop the clutch for science." He received his B.A. from the University of Missouri.

Jackie Scoggins
Jackie Scoggins | JScoggins@lbl.gov

Jackie Scoggins is a HPC Systems Engineer and is the group’s expert resource on batch schedulers and resource managers. Throughout her career, she has played a vital role in developing, deploying and operationally supporting scientific computing resources throughout the Lab. In addition to her 16 years in IT, she also worked six years at NERSC supporting HPC systems, including a management stint as the team lead for the Operations Technology group.
Jackie is a founding member of the Lab's African American Employee Resource Group (AAERG), and a member of the Women Scientists & Engineering Council and the Diversity Advisory Board. She was also a Professional Mentor for the Tech Women 2017 program and recently honored as one of the recipients of the prestigious 2018 Women @ The Lab award.
She holds a B.S. in Computer Science with a minor in Mathematics from California State University, Hayward. She enjoys teaching praise dance, singing Karaoke, planning events, and working with youth and young adults as a spiritual guidance leader.

John White
John White | JWhite@lbl.gov
John White is an HPC Systems Engineer specializing in storage systems. He works with customers from day one of cluster design through implementation, maintenance, and eventual retirement. Most of his career has involved design and implementation of parallel file systems, but his work touches almost every aspect of HPC work within the SCG.
His first job in HPC was fresh out of college in 2005 at the San Diego Supercomputer Center, where he was the lead engineer on Intimidata and the Teragrid IA64 Cluster, as well as GPFS-WAN, the first academic wide-area parallel file system. He moved to the Lab in 2008, where he finds building and maintaining systems that produce science with real-world impact very rewarding.
John holds a B.A. in Information Science and Technology from SUNY Albany. He is an avid hockey fan and homebrewer.

Student Interns

Andrei Khartchenko
| aak@lbl.gov
Andrei Khartchenko comes to aid the support staff of the many scientific computing systems at Berkeley Labs. He is an avid open source enthusiast who is always experimenting with software and hardware in and out of the lab. Prior to college he worked on the installation of networks for many businesses in the Bay Area. Andrei recently has come back to City College of San Francisco as a refresher for his programming knowledge and is near finishing his Associate of Science in Computer Science. He also holds a Bachelor's degree in Economics from the University of California, Santa Cruz. When Andrei is not behind the keyboard he enjoys going on long roadtrips, exploring the wilderness, and long walks with his dog.

Edison Lam | elam3@lbl.gov

Edison Lam will be helping with the support of the HPC systems at the Berkeley Labs as an intern this summer. He is studying computer science at the City College of San Francisco and will be transferring to a four year institution next year. Edison studied Linux administration at CCSF, which led to a certification through Red Hat. He currently holds a certificate for the RHCSA, and plans on getting the RHCE later this year.

During his free time, he likes to explore bicycle routes in the Bay Area.

Steven WongSteven Wong | SJWong@lbl.gov

Steven Wong is an intern helping manage the HPC clusters and support its users. He previously worked as a computer science tutor and aide at his college, helping students with programming and teachers with lesson planning. He has a RHCSA and has plans on testing for the RHCE.

Steven currently studies at City College of San Francisco and has plans to move on to a four year university in the future. In his leisure time, he enjoys long distance running, rock climbing, baking, and board & video games.