Noah Greifer
Statistical Consultant
New York, New York, United States
Summary
👤
Senior🎓
Top SchoolNoah Greifer is a statistical consultant and R package author at Harvard’s Institute for Quantitative Social Science with nine years of experience applying causal inference methods to problems in health and the social sciences. He develops and maintains widely used R tools—such as WeightIt, MatchIt, and cobalt—that implement propensity score matching, inverse probability weighting, and balance assessment, and frequently collaborates with substantive and methodological researchers. His PhD in Psychometrics and Quantitative Psychology underpins a rigorous blend of regression, machine learning, and optimization in his software and research. Active in public Q&A forums and GitHub issue threads, he channels community feedback into package improvements and reproducible workflows. Based in New York, he prefers technical discussion via GitHub, CrossValidated, or StackOverflow rather than LinkedIn, reflecting a strong open-source and community-driven support posture.
10 years of coding experience
7 years of employment as a software developer
University of California, San DiegoDoctor of Philosophy (PhD), Psychometrics and Quantitative Psychology, Doctor of Philosophy (PhD), Psychometrics and Quantitative Psychology at University of North Carolina at Chapel Hill
Stackoverflow
4,055reputation
131kreached
193answers
11questions
r
top-5%
Github Skills (92)
r10
r-package10
causal-inference10
hypothesis-tests10
duplicate-detection9
regression-models9
weighting9
mlmodel9
static-html9
simulation9
matching9
imputation8
bookdown8
inference8
package8
Programming languages (9)
Github contributions (5)
ngreifer/cobalt
Jul 2016 - Dec 2022
Covariate Balance Tables and Plots - An R package for assessing covariate balance
Contributions:2 reviews, 1460 commits, 17 PRs in 6 years 5 months
rr-packagecausal-inferencepropensity-scores
kosukeimai/MatchIt
Jul 2020 - Nov 2022
R package MatchIt
Contributions:2 reviews, 538 commits, 91 PRs in 2 years 4 months
rr-package
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