williammayes.com

Data Scientist · AI Evaluation · Behavioural Research

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Data Scientist & Senior Researcher, Care Quality Commission
ONS Data Science Campus Graduate, 2023–2025
University of Surrey, PhD Psychology, 2022

I am a PhD-trained data scientist with four years in national healthcare regulation, combining rigorous statistical foundations — causal inference, Bayesian modelling, experimental design — with hands-on experience building and evaluating AI systems where the consequences of error are real. My path was non-linear by design: clinical psychology settings, doctoral neuropsychology research, and national-scale NHS data work each added a layer that purely technical routes miss. I am drawn to problems where the statistical question and the human question are inseparable.

AI EvaluationLLM-as-judgeBayesian InferenceCausal InferenceExperimental DesignNLPPython · RReact · TypeScriptFastAPIAzure ML
§1 — Projects
github.com/wpmayes
Fig.2

Stateful Multi-Agent LLM Architecture · In development · Jan 2026

Common Ground

A multi-agent LLM system designed to explore statefulness, consistency, and controllability in model behaviour. Uses a three-model architecture: a primary generation model operating within persistent hidden state, a state-tracking model updating variables from user interaction, and a judge model for validation and safety. Includes local, offline inference via quantised models.

Multi-Agent LLMsStateful SystemsLLM EvaluationModel OrchestrationLocal InferenceQuantisation
§2 — Experience
Full CV →
PeriodRoleContributionMethods

2023–present

Data Scientist / Senior Researcher

Care Quality Commission

Contributed to structured bias evaluation of LLM outputs across all 9 protected characteristics under the UK Equality Act 2010, identifying statistically significant sex bias in harm classifications. Led safeguarding free-text classification and serious injury report classifiers. Prototyped time-series anomaly detection on patient safety records (~3 million rows) using Azure ML and TimeGPT. Appointed to lead internal AI governance project. Held end-to-end ownership of national NHS patient surveys (£200k–£300k budgets); findings covered by the BMJ, Guardian, Sky News, and BBC.

LLM EvalBias TestingMulti-Agent LLMXGBoostAzure MLTimeGPTPythonNLPFastAPI

2023–2025

Data Science Graduate

ONS Data Science Campus

Competitive cross-government programme: Python, ML, NLP, reproducible analytical pipelines, AWS/Azure, data science ethics. Selected alongside a small cohort from across government departments.

PythonML · NLPRAPAWS · Azure

2022–2023

Researcher

Care Quality Commission

Designed selection weighting methodology for an ethnic minority sample boost; findings on masked health inequalities shared with NHS England and the cross-government survey research group. Translated legacy SPSS pipelines into reproducible R and Python workflows; updated and maintained internal team R package.

RSurvey DesignWeightingRAP

2022

Consultant

Open University

Advised on methodology design for a study examining how movement of people with DCD is perceived by those with ASD; ensured diagnostic criteria alignment with DSM standards; recruited participants through DCD community groups.

Research DesignPsychometrics

2018–2022

Doctoral Researcher

University of Surrey

Four years of original quantitative research: MRS and fMRI neuroimaging, psychophysics, Bayesian computational modelling. First evidence of GABAergic dysregulation in DCD, resulting in first author publication.

Bayesian MCMCCausal InferenceR · MATLABfMRI · MRS
§3 — Press coverage
§4 — Publications
under review

Sensory atypicality in developmental coordination disorder is associated with cortical excitatory-inhibitory imbalance

Mayes, W. P., Gentle, J., Jones, D., Sattar, O., Papadopoulou, A., Ivanova, M., & Violante, I. R.

Journal of Neurodevelopmental Disorders

2024

Audio-visual multisensory integration and haptic perception in adults with developmental coordination disorder

Mayes, W. P., Gentle, J., Ivanova, M., & Violante, I. R.

Human Movement Science · doi:10.1016/j.humov.2024.103180

2023

Exploring Executive Functioning of Adults With Probable Developmental Coordination Disorder Using the Jansari Assessment of Executive Functions

Mayes, W. P., Jansari, A., & Leonard, H. C.

Developmental Neuropsychology · doi:10.1080/87565641.2023.2264424

2022

The Nature and Influence of Sensory Processing Deficits in Developmental Coordination Disorder

Mayes, W. P.

Doctoral thesis, University of Surrey · doi:openresearch.surrey.ac.uk/esploro/outputs/doctoral/The-Nature-and-Influence-of-Sensory/99648766202346

2021

Top-down inhibitory motor control is preserved in adults with developmental coordination disorder

Mayes, W., Gentle, J., Parisi, I., Dixon, L., van Velzen, J., & Violante, I.

Developmental Neuropsychology · doi:10.1080/87565641.2021.1966431