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Timothy Dean

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Senior Data Scientist at Dell Technologies · Python, time series

Works at
Dell Technologies
Location
San Francisco, CA · PT (UTC-8)
Experience
10+ years experience
Education
Duke University
Languages
English
Message Connect

Overview

I work on demand forecasting at Dell Technologies in San Francisco. Taught SQL to 53 non-analysts. Before that: Pinterest and Lockheed Martin. I write a small newsletter about demand forecasting.

Good reasons to reach out
  • Second opinions on SQL decisions
Please don't message about
  • Crypto token projects
  • Unpaid work or spec projects
  • Agency or outsourcing pitches
Skills
SparkProphettime seriesSQLinventory optimisationPython

Experience

  1. Senior Data Scientist
    Apr 2024 - Present
    Dell Technologies · 2 yr 7 mo · Full-time · San Francisco, CA
    • Built the forecasting models now used in 9 product decisions a quarter.
    • Wrote the metric definitions the leadership team reviews every week.
  2. Data Analyst
    Sep 2022 - Apr 2024
    Pinterest · 1 yr 7 mo · Contract · San Francisco, CA
    • Replaced 69 hand-built dashboards with one metrics layer people trust.
  3. Data Scientist
    Feb 2021 - Sep 2022
    Lockheed Martin · 1 yr 7 mo · Full-time · San Francisco, CA
    • Cut forecast error from 24% to 10% across 2383 SKUs.
    • Taught SQL to 41 non-analysts.
  4. Data Scientist
    Aug 2018 - Feb 2021
    Pinterest · 2 yr 6 mo · Full-time · San Francisco, CA
    • Cut forecast error from 33% to 6% across 2982 SKUs.
  5. Data Analyst
    Oct 2016 - Aug 2018
    Reddit · 1 yr 10 mo · Full-time · San Francisco, CA
    • Wrote the metric definitions the leadership team reviews every week.

Projects

Conference talk: lessons from forecasting
2026

What went wrong and what worked while scaling demand forecasting.

Demand forecasting benchmark
2025

Reproducible benchmarks comparing inventory optimisation and Prophet on real workloads.

References

No references yet.

Education

  1. Duke University
    BS, Mathematics
    2011 - 2015

Details

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