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Our People
We are a diverse team with a collaborative sense of purpose.

Computation is a team of 1,000 smart, collaborative, innovative people who are inspired by working on advanced, game-changing solutions to some of the world’s most difficult problems. They’re world-renowned experts, mothers and fathers, award winners, strategic thinkers, sports enthusiasts, globetrotters, and lifelong learners—people whose personal values motivate them to make a difference in the world.

Learn more below about some of the people who make up our team.


portrait of Dean Williams
Dean Williams
Climate Data Scientist

I lead and provide the vision for several international climate data collaborations, including the Earth System Grid Federation. I’m also the lead computer scientist for Livermore’s climate program, where I design and develop data analysis and visualization tools to support high-level modeling.

I love what I do. I truly work at an awesome place with awesome colleagues.

In my free time, I coach track at the high school and youth level. In high school, I was one of the premier track athletes in California.

Portrait of LLNL's Peter Robinson
Peter Robinson
Scientific Software Engineer

I convince some of the world’s largest supercomputers to run one of the world’s most advanced simulation codes in service of our national interest.

At LLNL, I get to work with a lot of really smart people on extremely challenging problems in a really cool application space. Plus, being able to play on some of the world’s largest supercomputers without writing any grants is a huge perk.

I once got to be on NPR’s Car Talk program, during which Click and Clack (Tom and Ray Magliozzi) justifiably called me a knucklehead for allowing my car to be frozen to the street in Boulder, CO.

Portrait of Greg Lee, LLNL computer scientist
Greg Lee
Computer Scientist

I help scientists make sure their simulations run correctly and efficiently on LLNL’s supercomputers. This involves interacting with the code developers and users, working on the simulation codes, supporting third-party tools, and developing our own in-house tools. The goal is to maximize our users’ productivity and ultimately to facilitate good science towards the laboratory’s mission.

Prior to joining the lab, I was a professional tennis player and coach, at one point ranked 1326 in the world. I also recreationally enjoy other sports such as basketball, ultimate Frisbee, and bicycling. Other hobbies include cooking, hiking, and photography.

Tanzima Islam portrait
Tanzima Islam
Postdoctoral Researcher

I study how to improve the performance of scientific applications running on large-scale supercomputers. The knowledge that my efforts are vital in making supercomputing environments a transparent vehicle for advances in basic science is exciting!

In my free time, I love reading books and traveling because both teach me so many new things.


Punita Sinha
Computer Scientist and Group Leader

I work with and manage a team of computer scientists who work in software development on large multi-physics codes. These codes model real-world physical phenomenon with sets of mathematical equations. Simulation software allows us to mimic an experiment, the way animation simulates real-world situations or characters in a movie. Since these problems can take days, weeks, or months to run, we speed them up by running pieces in parallel on hundreds of thousands of computer processors—think of your iPhone as a single processor. What is exciting is that we work with state-of-the-art supercomputers, such as Sequoia.

Outside of work, I enjoy gardening, interior decoration, and crafts.

Olga Pearce
Lawrence Scholar

I am a computer scientist working on speeding up simulations that run on supercomputers. I get to work on real problems, and my work impacts cutting-edge science. 

I am an avid runner. Running lets me enjoy the outdoors, and gives me yet another outlet to be competitive and challenge myself.

Portrait of Bill Oliver, Software Developer
Bill Oliver
Software Developer

I develop software for a visualization package that can be used to render models and animations of how materials react to shock loads. The work involves a lot of scientific programming, requiring me to make extensive use of my degree in mathematics.

The biggest perk in my job is the people I work with and for.

As a child and through high school, I was on track to becoming a concert pianist. 

Portrait of Michael Loomis, Computer Scientist/Animator
Michael Loomis
Computer Scientist/Animator

I help scientists and engineers at the lab communicate their ideas through animation using the same software and techniques as the movie/special effects industry.

My job allows me to be creative in a technical field.  I get to work on a number of projects and see what others are doing across the Laboratory. There are fresh challenges to meet at every turn.

Outside of work, my passion is music. I play lead guitar in a rock band. I also built a recording studio in my home.

Rob Neely
Associate Division Leader and Advanced Architecture Software Development Lead

Imagine computers so powerful and intricately programmed that they allow us to understand the impacts of explosives without blowing anything up, optimize a product’s design before the first metal piece is forged, or unravel the physics mysteries at a star’s center. Making that vision a reality requires the efforts of thousands. I am part of a vast nationwide team working to build the hardware and software ecosystem that allows us to push the frontiers of computing while also making it approachable to a broader audience.

I also recently started playing the piano for fun.

Portrait of Lisa Belk, IT Manager for GS-CAD at LLNL
Lisa Belk
Information Technology Manager

I support the nonproliferation, energy security, intelligence, and defense missions of LLNL’s Global Security organization. I enjoy collaborating each day with experts in computer technology and cyber security teams to solve unique challenges. I’m also part of institutional committees that set the direction for the growth of IT services to meet customer needs and reduce the cost of doing business at LLNL.

 I really enjoy working on exciting and varied projects that have a direct impact on national security initiatives.

I recently published my first children’s book, The Adventures of Moe the Moose.

Brian Gunney
Computer Scientist/Math Programmer

I develop algorithms to help scientists run high-resolution simulations on supercomputers. Modern supercomputers and scientific math models have such different inherent characteristics that scientists can’t simply plop the model onto the computer and assume the problem will be solved efficiently. Our algorithms fit the math model to the computer and—the most interesting part—adapt the fit to the problem.

At LLNL, I get to work with some of the brightest scientists in the world, and I have access to the fastest computers, too.

I also volunteer for AFS, a world-wide high school student exchange organization.  I support students and their host families, and I help train other support volunteers.

Jeene Villanueva
Software Developer

Computational Engineering Group Leader, ASQ Division/Enterprise Modeling Data Applications Lead/Computer Scientist

I work on a dynamic, data-driven, web-based application used for calculations on stockpile life-cycle, infrastructure transformation, critical skills, data trends, and budget projections. The best part of my job is working with intelligent people who value the challenging work that we do, but understand that work-life balance is important.

I also enjoy scrapbooking, visiting science museums with my family, and trying new restaurants.

Portrait of Chris Morrone, LLNL Computer Scientist
Chris Morrone
Computer Scientist

I work on some of the world’s fastest, most cutting-edge supercomputers. It takes over 20,000 hard drives to store the data that feeds our largest computer, Sequoia. As team lead for Lustre development, I work on the software that coordinates all of those individual moving parts into a single, fast, reliable file storage system.

I also like cooking, gardening, and tinkering with computers and electronics.

Portrait of Maya Gokhale, Distinguished Member of LLNL Technical Staff
Maya Gokhale
Distinguished Member of Technical Staff

I lead a research team of talented computer scientists and students in designing new computer hardware and software methods that can crunch data many times faster than we can today. Our methods apply to computers out in the field used to analyze environmental samples and to supercomputing clusters used to study web and social network data. As a computer scientist, I appreciate working with applications experts who can truly evaluate the benefits and drawbacks of the tools my team creates. The Lab provides a unique opportunity to put our contributions to the litmus test in the real world.

I also like doing backbends and headstands in yoga. You can look at the world from a different perspective!

Portrait of Trent D’Hooge, LLNL Platform Deployment Architect
Trent D’Hooge
Platform Deployment Architect

I help LLNL employees and vendors deploy hardware into production that doesn’t yet exist to the general public. I get to work with the latest and greatest hardware and provide a productive resource to our users. Deploying early hardware always involves new problems that need to be solved, which keeps my job interesting.
I also enjoy high-performance driving at race tracks around Northern California.

Portrait of Tom Slezak, LLNL Associate Program Leader
Tom Slezak
Associate Program Leader

I manage a group of extremely talented and motivated biologists and software engineers who find innovative solutions for diagnosing and characterizing dangerous pathogens. We find ways to efficiently analyze the DNA of pathogens involved in bioterrorism, food safety, and human and animal health. I also collaborate with experts from many different countries and regularly interact with the FBI, the Centers for Disease Control and Prevention, the Food and Drug Administration, the U.S. Environmental Protection Agency, and many other federal agencies.
I travel the world for my job. I also had a unique and memorable experience teaching at Beijing University in 1986. Ask me about it sometime.

Portrait of Scott Kohn, LLNL Associate Program Leader
Scott Kohn
Associate Program Leader

I run a cyber security research program of about 25 researchers. I split my time between providing technical direction to address interesting cyber security needs and doing cool technical work. I started at LLNL in 1997 but left for a biotech start-up in 2003. I came back a year later because I missed the Laboratory mission, the diversity of interesting work, and the extraordinary people.

For me, the most important things in a job are to work on a mission that matters, work with the latest technology, and work with really smart people. You get to do that here.


Portrait of Johnnie Shell, LLNL Senior Support Computer Technologist
Johnnie Shell
Senior Support Computer Technologist

I monitor, troubleshoot, and initiate recovery procedures on LLNL computers, storage, and network equipment. The best part about my job is that I work with the latest technology and some of the largest and fastest computers in the world. LLNL is a great place to work—I’ve been here for 44 years.
I like my job, and what I love is spending time with my 6-year-old grandson, Denzil, who enjoys reading, writing, math, baseball, and

Portrait of Juan Hernandez, LLNL Computer Scientist
Juan Hernandez
Computer Scientist

I build software tools, analyze code using third-party applications, and develop Web applications that support LLNL’s software quality activities. I spent seven years in the U.S. Army, and I love that the work I do now benefits national security. The software developed at LLNL is more specialized than what you find in most companies. It’s designed to solve a specific problem or to study natural behavior, and the software quality practices must be tailored accordingly.

I’m also active in LLNL’s Amigos Unidos Employee Affinity Group, and I’ve taught onsite Spanish classes.

portrait of Dean Williams
Portrait of LLNL's Peter Robinson
Portrait of Greg Lee, LLNL computer scientist
Tanzima Islam portrait
Portrait of Bill Oliver, Software Developer
Portrait of Michael Loomis, Computer Scientist/Animator
Portrait of Lisa Belk, IT Manager for GS-CAD at LLNL
Portrait of Chris Morrone, LLNL Computer Scientist
Portrait of Maya Gokhale, Distinguished Member of LLNL Technical Staff
Portrait of Trent D’Hooge, LLNL Platform Deployment Architect
Portrait of Tom Slezak, LLNL Associate Program Leader
Portrait of Scott Kohn, LLNL Associate Program Leader
Portrait of Johnnie Shell, LLNL Senior Support Computer Technologist
Portrait of Juan Hernandez, LLNL Computer Scientist