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Lucas BrooksLB
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Lucas Brooks

@lucasbrooks

I build privacy-preserving machine learning systems, synthetic data products, and tabular foundation models.

United States
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At Capital One Applied Research, I lead tabular foundation model and LLM-generated synthetic data work from research through open-source, production-usable releases. I’m second author of PersonaLedger, a 30M-transaction synthetic financial benchmark used to evaluate 14 models for illiquidity classification and identity-theft detection.

I’ve built federated learning, differential privacy, secure aggregation, and privacy-leakage evaluation systems across financial and healthcare data. My work includes Capital One’s open-source Federated Model Aggregation framework, a federated learning patent, and LLM-based generation gates that identify risky candidate generators before data is shared.

I also build practical research infrastructure with LangGraph, AWS, Airflow, EKS, MLflow, and Python, while mentoring ML engineers and setting privacy and interpretability review standards.

Experience

Work history, roles, and key accomplishments

Capital One logoCO
Current

Lead Machine Learning Engineer

Jan 2026 - Present (7 months)

Sets Applied Research direction for tabular foundation models and LLM-generated synthetic data, carrying that work through to published, open-sourced, production-usable form. Second author on PersonaLedger, a persona-conditioned LLM generation system paired with a programmatic engine enforcing accounting correctness through iterative feedback, producing 30M transactions across 23,000 synthetic use

Capital One logoCO

Senior Machine Learning Engineer

Jul 2023 - Mar 2026 (2 years 8 months)

Moved privacy-preserving synthetic data from tabular generators to LLM-based generation, and built the evaluation gates that let it clear model risk review. Fine-tuned Llama 3 with LoRA/QLoRA and DPO for structured financial record generation and extraction, improving exact-match extraction by ~15 points over the prompt-only baseline.

Capital One logoCO

Machine Learning Engineer

Apr 2022 - Jul 2023 (1 year 3 months)

Hired to bring federated learning and privacy expertise into Capital One's machine learning research program. Publicly credited contributor to Federated Model Aggregation (FMA), Capital One's open-sourced federated learning framework, and co-inventor on a patent for federated learning utilizing customer synthetic data models.

Equideum Health logoEH

Software Engineer, Machine Learning

Equideum Health

Mar 2020 - Jan 2022 (1 year 10 months)

Joined at spin-off to build the federated learning engine behind a privacy-first health data network, proving models could train on hospital and genomic data that could never be pooled. Built the federated training and secure aggregation layer for Equideum's Data Integrity and Learning Network (DILN), enabling joint model training across partner health systems while records stayed inside their ori

VD

Research Assistant: Computational Neuroscience

Voytek Lab, UC San Diego

Feb 2019 - Jun 2020 (1 year 4 months)

Developed the lab's data-analysis pipeline for evaluating time-resolved spectral estimation methods on neuroelectrophysiological recordings, replacing per-researcher ad hoc comparisons with a single reproducible benchmark. Applied specparam and neurodsp to analyze periodic and aperiodic spectral dynamics in ECoG data.

ConsenSys logoCO

Intern: Collaborative AI

Jun 2019 - Mar 2020 (9 months)

R&D on private and collaborative machine learning systems, work that seeded the Equideum Health spin-off. Prototyped collaborative training with PySyft and PyTorch, benchmarking federated averaging against centralized baselines on partitioned health datasets and quantifying the accuracy gap.

CB

Director

Central Coast Blockchain

Dec 2017 - Aug 2018 (8 months)

Built a regional blockchain community, running educational and collaborative programming for developers, entrepreneurs, and business owners, an entry point into the distributed-systems work that followed at ConsenSys.

EL

Field Engineer | Assistant Project Manager

ENTACT, LLC

Jun 2016 - Nov 2017 (1 year 5 months)

Developed a cyclic well operation method that cut water cut from 90% to under 10% while reducing energy use; managed scheduling and accounting for a $5MM Chevron EMC project using Viewpoint and Excel, with AutoCAD Civil 3D and Trimble GPS for volume analysis and as-builts.

Education

Degrees, certifications, and relevant coursework

University of California, San Diego logoUD

University of California, San Diego

Master of Science, Machine Learning

2018 - 2020

Master's in Computational Science with a focus on Machine Learning.

The Pennsylvania State University logoTU

The Pennsylvania State University

Bachelor of Science, Petroleum & Natural Gas Engineering

2012 - 2016

Bachelor of Science in Petroleum & Natural Gas Engineering.

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