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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.

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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
soccer.

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 Kathryn Mohror, LLNL Postdoctoral Researcher
Kathryn Mohror
Computer Scientist

I help the fastest machines in the world run efficiently. Failures are a big problem on machines this big, and they can happen at any time during a program run. My job is to keep these failures from impacting application run time so that domain scientists can get the answers they need as quickly as possible. Every day on the way to my office I walk by the machine room and get to see Sequoia, one of the fastest computers in the world. There’s really not much that can top that in my book.

I also love gardening, cooking, yoga, running, and cycling.
 

Portrait of Anh Tu Quach, LLNL Computer Scientist
Anh Tu Quach
Computer Scientist

I develop dynamic, data-driven Web apps that help the Lab’s environmental analysts and hydrogeologists plan, track, and pay for the regulatory sampling activity so the Lab remains compliant and open for business. I was initially drawn to LLNL because of the location, job content, and people, and I’ve stayed because of the opportunities. For example, the Lab fully funded my master’s degree. I also have great managers who provide creative freedom, shield me from the politics, and send me to training, like the annual jQuery Conference in San Francisco.

I understand five languages (thanks to watching a lot of kung fu movies). My hobbies include reading, watching kung fu movies, and accidental gardening. I tweet about STEM.
 

Portrait of John Fisher, LLNL Tools Architect
John Fisher
Software Developer

As NIF Engineering Tools Architect, I manage the design and architecture efforts for software development and engineering in the NIF directorate. This includes software development, QA, and configuration management tools. I focus on integrating the latest industry technologies to make a better product and a more efficient development team. It’s a privilege to work with extremely bright people in a variety of technical areas, such as physics, engineering, and NIF operations.
 
Outside work, I love woodworking, cycling, and jazz music.
 

Portrait of Matthew Myrick, LLNL Cyber Security Engineer
Matthew Myrick
Cyber Security Engineer

I protect the Laboratory and its data from “bad guys” in the cyber world. Very few workplaces in the world allow you to work on cutting-edge science problems in the national interest with the world’s best and brightest people as your colleagues in the beautiful San Francisco Bay Area.

I also love to travel; I once visited Chernobyl and toured around reactor four and the small abandoned town of Prypiat where the reactor staff lived.

Portrait of Stacy Reed, LLNL Systems and Network Technologist
Stacy Reed
Systems and Network Technologist

I provide deskside support to some of the Lab’s top scientists and engineers. I love working with the IT team—they’re smart, hard-working, high-quality people.

I also have a 25-year old mitred conure named Jonah.

Portrait of Tami Campbell, LLNL Administrative Specialist
Tami Campbell
Administrative Specialist

I support ISCR, including Computation’s scholar program and our current research focus on data science.  Seeing the students I support hired to full-time positions makes it all worthwhile.

I’m also an avid gardener.

Portrait of Jonathan Allen, LLNL Informatics Scientist
Jonathan Allen
Informatics Scientist

I develop tools that detect and protect against pathogenic organisms that threaten the health of humans. The Lab provides me the opportunity to work on a range of challenging, high-impact problems.

I’m also a very busy father to three children under the age of 4.
 

Portrait of John Wong, LLNL Systems and Network Technologist
John Wong
Systems and Network Technologist

I configure and maintain Windows servers that control login account information and authentication. I work with a great bunch of people who are smart, talented, and fun.

I’m also a retired Marine Reservist who loves exercising and participating in mud runs.

Portrait of Albert Chu, LLNL System Software Developer
Albert Chu
System Software Developer

I write software for several of the world’s largest clusters and supercomputers. My software improves the reliability, efficiency, and performance of the systems. I appreciate that a lot of the code developed at the Lab is released as open source.

I’m a 2002 Seibel Scholar. And I can make balloon animals.

Portrait of Gregory Pope, LLNL Software Quality Engineer
Gregory Pope
Software Quality Engineer

I help debug planet earth, mostly by finding ways to make software more robust, safe, and secure. Ironically, I spent the first 20 years of my career inadvertently putting bugs into software as a developer before founding a software testing company. I’m spending these next 20 years creating better ways to get the bugs out.

I decided to go to college after spending a few summers collecting garbage. I also ski, hike, and ride motorcycles.

Portrait of Kathleen McCandless, LLNL Computer Scientist
Kathleen McCandless
Computer Scientist

I help model the physics of the world’s largest laser, set up experiments, and resolve equipment protection issues. I work with the top talent in several science disciplines and learn new physics and code development tools nearly every day. Most importantly, my work is helping scientists better understand material models and laser propagation issues, which will ultimately lead to improved clean-energy resources for mankind. 

Outside of work, I do Pilates almost every day and raise my two daughters who have entered the “tween” years.

Van Emden Henson
Mathematician

I help scientists understand how the universe and the world work by discovering efficient theories facilitating the expression of complex physics, engineering, and social interactions as extremely large systems of equations. Mostly, I devise algorithms. I’m two-thirds math geek and one-third computer geek, but still 100% geek. LLNL has some of the most challenging and important problems to solve. We also have some of the most sophisticated tools in existence to solve them, and when we need some whizbang tool that doesn’t exist, we invent it.

I picked up a Sport Pilot license in 2011, flying a Champ, and am working toward a Private Pilot-Glider license, flying a Grob.

Portrait of Todd Gamblin, Computer Scientist
Todd Gamblin
Computer Scientist

I find new ways to make simulations run fast on millions of processors at once. LLNL has one of the most vibrant HPC environments in the world. We have the world’s largest machines, the most sophisticated simulation codes, and world-renowned physicists all in one place. I learn something new every day.

I’ve taken up climbing since moving to the Bay Area from the East Coast in 2008.

Portrait of Kevin Griffin, LLNL Computer Scientist
Kevin Griffin
Computer Scientist

I research and develop software for a distributed, parallel visualization and graphical analysis tool, called VisIt, which processes data defined on two- and three-dimensional (2D/3D) meshes. This software is used world-wide for scientific visualization and runs on some of the most advanced high performance computing (HPC) systems to include LLNL’s own state-of-the-art HPC environment.
 
I’ve also been afforded the opportunity to work on my PhD at the University of California, Davis through the Lab’s tuition-free, on-site degree program. LLNL’s alternative work schedule (AWS) program allows me to schedule days off during the work week to attend classes and stay on top of my studies. In my free time I enjoy doing home renovation projects, mobile programming, and occasionally training for a local half-marathon.

Portrait of Scott Kohn, LLNL Associate Program Leader
Portrait of Johnnie Shell, LLNL Senior Support Computer Technologist
Portrait of Juan Hernandez, LLNL Computer Scientist
Portrait of Kathryn Mohror, LLNL Postdoctoral Researcher
Portrait of Anh Tu Quach, LLNL Computer Scientist
Portrait of John Fisher, LLNL Tools Architect
Portrait of Matthew Myrick, LLNL Cyber Security Engineer
Portrait of Stacy Reed, LLNL Systems and Network Technologist
Portrait of Tami Campbell, LLNL Administrative Specialist
Portrait of Jonathan Allen, LLNL Informatics Scientist
Portrait of John Wong, LLNL Systems and Network Technologist
Portrait of Albert Chu, LLNL System Software Developer
Portrait of Gregory Pope, LLNL Software Quality Engineer
Portrait of Kathleen McCandless, LLNL Computer Scientist
Portrait of Todd Gamblin, Computer Scientist
Portrait of Kevin Griffin, LLNL Computer Scientist