David Nield

Data Scientist

Callisto Media

I am a data scientist at Callisto Media, a data-driven book publishing company based in the San Francisco Bay Area. I identify product opportunities and develop predictive models, KPIs, research workflows, and data infrastructure.

Previously, I was a PhD student in Political Science at the University of California, Berkeley, where I conducted research on topics ranging from political misinformation, “small world” network dynamics, campaign finance networks, and prejudice against Muslim-Americans.


  • Design-based causal inference
  • Machine learning
  • Network analysis
  • Data visualization


  • MA in Political Science, 2019

    University of California, Berkeley

  • BS in Political Science, 2017

    The Ohio State University



Data Scientist

Callisto Media

Jul 2019 – Present Emeryville, California
  • Building revenue forecasts and other predictive models
  • Designing and analyzing e-Commerce A/B tests
  • Developing KPIs, data workflows, and infrastructure

Graduate Student Instructor

University of California, Berkeley

Aug 2018 – May 2019 Berkeley, California
  • Courses taught: Crime and Democracy (56 students) and Political Psychology and Involvement (53 students)
  • Created and presented weekly lectures, including explaining the interpretation of statistical tables and logic of different research methods to students with no statistics training

Politics Intern


Jun 2016 – Aug 2016 New York, New York
  • Produced data visualizations and wrote three articles covering the 2016 election for a large popular audience (over 10 million unique monthly visitors during 2016)
  • Provided research support (collecting and analyzing data) for three other major projects spanned survey data, CDC data, and Twitter data

Editor in Chief

The Journal of Politics & International Affairs

Jan 2015 – May 2016 Columbus, Ohio
  • Chief executive of a student-run social science research journal that published undergraduate research from across the country (editorial staff of 15 students, over 200 research article submissions annually)
  • Organized the Ohio State Political Science department’s annual undergraduate research symposium