Dr. John Lombard
Theoretical Physicist
- Ph.D Physics
- University of Washington, 2018
- M.S. Physics
- University of Washington, 2014
- B.A. Physics, Mathematics, Cum Laude
- Cornell University, 2013
- B.S. Mechanical Engineering, Applied Math Minor, Cum Laude
- Cornell University, 2013
I work at the interface of physics, mathematics, and statistics, understanding nascent properties of complex systems by developing minimal mathematical models and validating novel techniques in stochastic optimization and network algorithms.
I also manage operations research teams in my industry role as a director of data science, where I am an expert in problem identification, rapid response insight-to-action targeting, what-if
simulated scenario testing, and communication of complex technical
strategy and results-impacts across business hierarchies for driving research innovation and product value
Awards
For Research, Teaching, and Data Science
University of Washington
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Kenyon Endowment
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Awarded for my graduate teaching career in the physics department
University of Washington
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With Distinction
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Awarded for outstanding teaching ability during my first graduate year
University of Washington
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Entrance Scholarship
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Awarded to entering graduates who show exceptional promise
Cornell University
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MAE Departmental Award
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Awarded for my thesis as presenting the best original solution to a technical design problem
United Services Automobile Association
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Data Science
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Awarded for cross-functional collaboration in delivery of novel genAI solutions for business value
United Services Automobile Association
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Data Science
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Awarded for innovation excellence and embodiment of the mission to deliver transformative technologies
Toolkit
Some Things I've Picked Up Along the Way
Programming
Techniques
Engineering
Humanities
Academic Research
Making the Unknown, Known
Gradient-Free Optimization
Network Dynamics
Emergent Geometry
Sampling Abstract Simplicial Complexes
Combinatorial Hives
Cold Atom Physics
Gradient-Free Optimization
Applications of optimization are everywhere, from the pure mathematics seen in my other research, to industry uses in operations or engineering design. But when the cost function is highly non-analytical or derived from a simulation, traditional methods of gradient-based approaches fail to be robust. Cost functions may have extremely long evaluation times, making many approaches prohibitive, especially if the optimization manifold is non-stationary and an answer is desired within a given operational window. Lastly, global optimization for multi-modal functions always presents interesting challenges to overcome. My research deals precisely in the domain where all of these problems are present. Developing new approaches to high dimensional gradient-free stochastic optimization on constrained multi-modal functions is my expertise, and I have developed an extensive software package (soon to be announced!) that contains the body of my work in this area for licensed commercial and academic use.
Network Dynamics
What does it mean for two networks to ‘connect’? If you have separate networks, whether they be networks of commerce, distribution networks, or social networks, is there a ‘naturally best’ network that connects them? Can we design a minimal system that generates such a network, and using this tool, can we then better serve the needs of our networks–creating optimal pathways to connect people, places, and ideas?
These questions are at the heart of my ongoing research, building off my network gravity framework and implementing the theoretical technology on real-world problems.
Emergent Geometry
What are the fundamental building blocks of the universe, and how to they fit together to weave the fabric of space-time? Is there something natural about the fact that we live in a 3+1 dimensional universe? What dynamics exist at the interface between space-time and the empty state? These are all questions that I attempt to make rigorous progress towards answering using a novel construction that I’ve developed for studying emergent geometry from the combinatorial bulk. With some early successes, there are still numerous open questions that my framework can probe, and this research is very much ongoing.
These questions are at the heart of my ongoing research, building off my network gravity framework and implementing the theoretical technology on real-world problems.
Sampling Abstract Simplicial Complexes
These combinatorial objects are about as far away from smooth manifolds as you can go while still retaining some semblance of discrete geometry. I use them extensively in my emergent geometry research, and in the course of this work, I needed methods of sampling on certain spaces of these complexes. Creating Markov chains on this space with good conductance or strong ergodic sampling properties is extremely difficult due to their constrained nature, and developing, characterizing, and implementing algorithms to walk through this space is part of my ongoing research.
Combinatorial Hives
These extremely cool mathematical objects are solutions to a highly non-trivial integer linear program. They have applications throughout representation theory, but also random geometry, matrix ensembles, and combinatorics. I study methods of generating hive solutions, both in relaxed and integer cases, through Riemannian optimization methods and through constrained random walks. I also develop estimation algorithms for counting distinct hive solutions, a process that yields an important combinatorial number called a Littlewood-Richardson coefficient.
Cold Atom Physics
My undergraduate research was in the Vengalattore Group in the Laboratory of Atomic and Solid State Physics at Cornell. We created some of the coldest temperatures in the universe in order to study an exotic form of matter known as a Bose-Einstein Condensate. My work involved the engineering design, simulation, construction, and implementation of a variety of critical laboratory components for studying Lithium based condensates as a new atomic species of interest, creating hardware from frequency locked laser systems to a Zeeman slower.
Patents
Innovating in Industry
Call Center Load Balancing and Routing Management, Continuation, 2023, US11716422
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High Fidelity Call Center Simulator, 2023, US11671535
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Call Center Load Balancing and Routing Management, 2022, US11233905
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System and Method for Dynamic Route Guidance During Contagion Outbreaks, 2021, Pending
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System and Method for Dynamic Contagion Response, 2020, Pending
Public Works