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James Mackenzie

Head of Data, Vellum AI — causal inference · Python · Bayesian statistics

London, UKVellum AIImperial College London
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Open to

Co-foundercloses in 3 months
Looking for a design-minded co-founder for school fee payments for community banks

I bring 17 years of experimentation (currently Vellum AI). Ideally you've built ML systems in production. Incorporated, self-funded so far.

London, UK · Remote OKcausal inferencecupedpython
Hiringcloses in 3 months
Building out experimentation at Vellum AI: data scientists wanted in London

Comp £101k–£136k. We decide within ten days. Message me with one thing you shipped that you're proud of.

London, UKbayesian statisticssqlpython

About

Head of Data at Vellum AI, focused on experimentation. Ran 175 experiments last year and made the readouts self-serve. Before that: EY and Arm.

Skills
CUPEDA/B testingSQLBayesian statisticsPythoncausal inference

Experience

  1. VE
    Head of Data
    Vellum AI
    Jun 2025 – Present · 1 yr 4 mo · London, UK
  2. EY
    Staff Data Scientist
    EY
    Apr 2022 – Jun 2025 · 3 yr 2 mo · London, UK
  3. AR
    Data Scientist
    Arm
    Oct 2020 – Apr 2022 · 1 yr 6 mo · London, UK
  4. ST
    Data Scientist
    Standard Chartered
    May 2018 – Oct 2020 · 2 yr 5 mo · London, UK
  5. DE
    Senior Data Scientist
    Deloitte
    Dec 2014 – May 2018 · 3 yr 5 mo · London, UK

Education

  1. Imperial College London
    MEng, Statistics
    2012 – 2014
  2. University of Oxford
    BA, Statistics
    2005 – 2008

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