Collin
Wittenstein

TURNING MATH INTO FAST CODE

Visiting Student @ MIT | JGU Mainz

About Me

Hi, my name is Collin. In my research, I use clever mathematics and clever coding to make PDE simulations go brrrr.

More practically, I work across the computational pipeline for solving partial differential equations. This means for example deriving structure-preserving numerical methods, implementing them and making sure everything runs fast on both CPUs and GPUs.

Right now I'm a visiting student @ MIT (Fall 2025–Spring 2026) working with Robert Metcalfe and Alan Edelman on GPU-accelerated simulations of geothermal well arrays. Back home at Johannes Gutenberg University Mainz, Germany, I'm finishing up dual master's degrees in Physics and Computational Sciences, building on my bachelor's in Physics and Mathematics.

One thing I really enjoy about my work is how varied the problems are. In the past couple years I've worked on weather simulations, the counterintuitive rattleback dynamics, water wave modeling, and now geothermal energy systems. Keeps things interesting.

AI Academic Transparency

I believe in being transparent about the AI tools I use. I maintain a detailed AI Code of Conduct documenting how I use AI tools (Claude, Claude Code, GitHub Copilot) in my academic work, emphasizing verification, understanding, and maintaining intellectual integrity.

Collin Wittenstein Easter Egg

Publications

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Research &
Projects

Geothermal Well Simulations

Currently I am working on GPU-accelerated simulations of geothermal well arrays using Julia at MIT's Julia Lab with Prof. Alan Edelman and Prof. Robert Metcalfe. More to come here soon (when I have nice picss to share).

Water Wave Simulations

I worked on dispersive shallow water equations. The following visualization shows the evolution of a wave over Gaussian bathymetry, using the hyperbolic approximation of the Serre–Green–Naghdi equations in two dimensions. The simulation employs a new energy-conserving semi-discretization that maintains physical properties over long time integrations. I also worked quite a bit on DispersiveShallowWater.jl, a Julia package that implements structure-preserving numerical methods for one-dimensional dispersive shallow water models. Both supervised by Prof. Dr. Hendrik Ranocha.

Rattleback Simulation

For my (maths) bachelor thesis, I simulated the movement of the rattleback (German: Wackelstein), a semi-ellipsoid with an inhomogeneous mass distribution that exhibits quite counterintuitive behavior: it can spontaneously reverse its spinning direction. This phenomenon defies intuition but follows directly from the solutions of its equations of motion. Supervised by Prof. Dr. Hendrik Ranocha and Univ.-Prof. Dr. Elmar Schömer.

Rattleback with turtle weights

Image: Ed Keath, CC BY-SA 3.0, via Wikimedia Commons

For this work, I received the best bachelor's thesis in mathematics of the year award.

Open Source
Contributions

I like to contribute to the Julia open-source community. Here are some of my contributions to other people's repos.

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Curriculum Vitae

For my full CV as PDF:

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Academic Background

Visiting Student, MIT (Sep 2025–May 2026)
Master Thesis Research with Prof. Alan Edelman and Prof. Robert Metcalfe

Johannes Gutenberg University Mainz (Oct 2019–May 2026)

  • M.Sc. Computational Sciences — Grade 1.0 (US GPA: 4.0)
  • M.Sc. Physics — Grade 1.1 (US GPA: 3.9)
  • B.Sc. Mathematics — Grade 1.2 (US GPA: 3.8)
  • B.Sc. Physics — Grade 1.3 (US GPA: 3.7)

Teaching

Teaching Assistant, Theoretical Physics (2021–2023)

  • Quantum Mechanics (Summer 2023)
  • Classical Mechanics (Summer 2022)
  • Special Relativity and Electrodynamics (Winter 2021)

Awards & Honors

Service & Leadership

  • Student Representative, Examination Board (2024–present) — Sole student rep for Computational Sciences, JGU Mainz
  • Co-founder & Vice Chair, Klimaliste Rhineland-Palatinate (2020–2021) — Led climate organization with 200+ members; featured in Teen Vogue and The Guardian
  • Organizer, Fridays for Future (2019–2021) — Organized climate protests with up to 12,000 participants

Reading

Is there anything nicer than recommending a book and having someone not only read, but actually enjoy it??
Anyway, here are some of my book recs:

The Covenant of Water
Abraham Verghese
A family saga across three generations in Kerala, following a mysterious affliction that passes through the family line. Beautifully written.
Roses would be annoying weeds if the blooms never withered and died. Beauty resides in the knowledge that it doesn't last.
Use arrow keys or click arrows to turn pages • Press 'S' to shuffle