About

I am a Ph.D. Candidate in Applied Mathematics and Statistics at Johns Hopkins University, advised by Mateo Díaz and Soledad Villar. My research sits at the intersection of optimal transport, Riemannian optimization, and manifold learning. Beyond research, I teach and mentor. My interests include cycling, artisanal coffee, and anime/TV shows.

Bio

I obtained an M.Sc. in Applied Mathematics and Statistics from Johns Hopkins University in 2024, and an M.Sc. in Mathematics from the Universidad Nacional de Colombia in 2020, where I worked on spectral geometry and noncommutative geometry under the supervision of Prof. Sylvie Paycha and Prof. Carolina Neira Jiménez. During my time there, I completed a research internship at the Institute for Mathematics of the Universität Potsdam. I worked as a Machine Learning Engineer at Vozy, a Latin American startup specializing in conversational AI. I also completed research internships at the Johns Hopkins University Applied Physics Laboratory and the Inter-American Development Bank.

News

November 2026

Looking for positions

I'm looking for academic postdoc and/or industry research positions. Send me an email! (See CV)

August 31-September 4, 2026

Talk at INABAG School+Conference

Presented research on estimation of Morse indices from samples at the INABAG School+Conference in applied algebraic geometry in Siena, Italy.

August 17-25, 2026

Minicourse and talk at UNAL Bogota (in Spanish)

June - August, 2026

Internship

I'm interning at the Interamerican Development Bank in the Systemic Risk Group working on Graph Models and Network Analysis applied to financial systems.

December 9-12, 2025

Poster Presentation

Presenting work on estimation of Morse information on manifolds at the Statistics and Data Science Workshop, Universidad de Los Andes.

May 27 -30, 2025

Optimization and learning: theory and applications, Montreal, Canada.

Projects

SRM

Systemic Risk Framework

Research Consultant · 2026 – Present

Developed a systemic risk framework that models direct and cascading dependencies across external drivers and institutional risk networks. Built a regularized graph autoregressive forecasting model that combines temporal lags with higher-order network effects.

GFA

Geometric Factor Analysis

Research · 2024 – 2026

Uncovering latent factors in data by mapping onto optimized orthogonal reference frames in the Stiefel manifold, combining optimal transport with Riemannian optimization to address rotational ambiguity in high-dimensional factor models.

Vision Guided Drone

Vision Guided Drone

Mentor · Feb 2025 – May 2025

Mentored three high school interns at Johns Hopkins University in developing autonomous drone navigation, implementing computer vision and path optimization algorithms for efficient flight.

Qudost

Qudost

Research · May 2023 – May 2024

Advances density estimation by framing it as a supervised learning problem, enabling real-time inference through universal approximation—research conducted at the Johns Hopkins University Applied Physics Laboratory.

VoBio

VoBio

Machine Learning Engineer · 2020 – 2021

Voice biometrics authentication system, developed using PyTorch and TensorFlow, that surpassed contemporary state-of-the-art benchmarks. Integrated into Vozy's client authentication framework with real-time inference capabilities.

Blog

December 4, 2024

Understanding Factor Analysis through geometric lenses

Exploring the intersection of geometry and statistical analysis to uncover hidden patterns in high-dimensional data structures.

Read more →

Publications & Preprints

Arxiv preprint · 2026
Wasserstein approximation of measures via orthogonal frames: statistical and computational complexities
Daniel López-Castaño, Mateo Díaz, Nicolás García Trillos, Congwei Yang
Established the near-parametric rate $O_d(n^{-1/2})$ for nonsmooth orthogonal-dictionary learning estimation for both the empirical risk minimizer and Riemannian SGD convergence. Research conducted in collaboration with Mateo Díaz (U. Chicago) and Nicolás García Trillos and Congwei Yang (Wisconsin-Madison).
Master's Thesis · 2020
A Distributional Approach to Asymptotics of the Spectral Action
Daniel López-Castaño
The spectral action, introduced by Chamseddine and Connes in 1997, is the natural and appropriate notion of an action on the space of spectral triples. After presenting key definitions and results from the Cesàro theory of distributions and asymptotic analysis, we discuss the asymptotic expansion of the spectral action in the distributional sense for a commutative spectral triple, following Estrada, Gracia-Bondía, and Várilly—research conducted at Universität Potsdam under the supervision of Prof. Sylvie Paycha.

Teaching

Johns Hopkins University

  • EN.553.781: Functional Data Analysis · Fall 2026 (Teaching Assistant)
  • EN.553.625: Machine Learning 2 · Spring 2025 (Teaching Assistant)
  • EN.553.620: Machine Learning 1 · Fall 2024, Fall 2023 (Teaching Assistant)
  • EN.553.660: Nonlinear Optimization 2 · Spring 2024 (Teaching Assistant)
  • EN.553.513: Directed Reading in Applied Mathematics · Fall 2024 — Geometry of the Space of Probability Distributions (Mentee: Shayaan Emran) (Mentor)
  • EN.553.513: Directed Reading in Applied Mathematics · Spring 2024 — Symmetries and Representations (Mentee: Minjae Kim) (Mentor)
  • EN.553.513: Directed Reading in Applied Mathematics · Fall 2023 — Spectral Geometry on Triangles (Mentee: Sukriti Gupta) (Mentor)

Universidad Nacional de Colombia

  • Geometric Data Science (Minicourse) · 2026-2 (Instructor)
  • Cálculo Diferencial (Calculus 1) · 2018-2, 2019-1 (Instructor)

Talks & Presentations

2026
Estimating Morse indices from samples
Short Communication INABAG School+Conference · University of Siena, Siena, Italy
2026
Wasserstein approximation of measures via orthogonal frames
Conference UN Encuentro de Matemáticas (70 años) · Universidad Nacional de Colombia, Bogotá, Colombia
2025
Estimating Morse information from samples
Poster Statistics and Data Science Workshop · Universidad de Los Andes, Bogotá, Colombia
2024
Geometric Factor Analysis ★ Runner-up Best Poster
Poster Optimization Workshop · Universidad de Los Andes, Bogotá, Colombia
2024
Geometric Factor Analysis
Poster SIAM Mathematics of Data Science · Atlanta, GA
2023
Inference-fast density estimation via universal approximators
Poster Johns Hopkins AI-X Foundry Fall Symposium · Baltimore, MD
2019
On vibrating strings, drums and what can and cannot be heard
Conference Colloquium, Mathematics Department · Universidad Nacional de Colombia, Bogotá
2019
On the distributional asymptotic expansion of the Spectral Action
Seminar Analysis Group Seminar · Universität Potsdam, Germany
2019
Sunada's technique for constructing isospectral manifolds
Short Communication Summer School on $L^2$-Torsion and Symmetric Spaces · Universität Göttingen, Germany
2019
A space of symbols and the Cesàro behavior at infinity
Seminar Analysis Group Seminar · Universität Potsdam, Germany
2019
Notions of Spectral Action
Short Communication Uniandes SRI-2019 on Geometry and Theoretical Physics · Villa de Leyva, Colombia
2018
Spectral Geometry and Spectral Action
Short Communication CIMPA School on Noncommutative Geometry and Index Theory · CIMAT Mérida, Mexico
2017
Index formulas of an elliptic operator
Short Communication School on Geometric, Algebraic and Topological Methods for QFT · Villa de Leyva, Colombia
2017
The weak$^*$ topology on distributions and calculation rules
Short Communication TOP3-UD · Universidad Distrital Francisco José de Caldas, Bogotá
2017
Radon measures: an approximation of the topological dual of $L^\infty$
Short Communication VII Encuentro Nacional de Matemáticas y Estadística · Universidad del Tolima, Ibagué

Tech Stack

Python Python
PyTorch
JAX JAX
Git
Docker
Flask
HTML5 HTML
JavaScript JavaScript
SQL
Bash