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<!DOCTYPE html>
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<h1 class="title">Vitor Hadad, PhD</h1>
</section>
<div class="value-props row">
<div class="one-half column"> <img class="u-max-full-width" src="images/photo2.png"> </div>
<div class="one-half column">
<p>
<h5>
<b>Applied Scientist</b><br />
Edge AI, Devices,<br />
Amazon Lab 126<br />
</h5>
<table>
<tr>
<td><i class="fas fa-file-alt"></i></td>
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Resume (PDF)</a></td>
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Google scholar
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LinkedIn</a></td>
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<span class="noupper copy-button" style="margin-right: 5%">hadad.vitor@gmail.com</span><i
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<ul class="navbar-list">
<li class="navbar-item"><a class="navbar-link" href="#aboutme">About me</a></li>
<li class="navbar-item"><a class="navbar-link" href="#journal">Articles</a></li>
<li class="navbar-item"><a class="navbar-link" href="#preprints">Preprints</a></li>
<li class="navbar-item"><a class="navbar-link" href="#software">Software</a></li>
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<!-- About me -->
<div class="docs-section" id="aboutme">
<h6 class="docs-header">About me</h6>
<p>
I'm an Applied Scientist at <a href="https://amazon.jobs/en/teams/lab126/">Amazon Lab126</a> and part of the
Edge AI team.
</p>
<p>
My work focuses on training and deploying <b>lightweight
multimodal perception AI models</b> that run on Amazon devices and support next-generation Alexa.
At Amazon I've also contributed to a variety of areas, from ML algorithms
for
<a
href="https://www.engadget.com/amazon-halo-rise-review-an-unobtrusive-bedside-sleep-tracker-thats-surprisingly-helpful-130037788.html">contactless
sleep tracking</a> via radar waves, to AI/ML tools for synthetic data generation and automatic data augmentation.
</p>
<p>
Prior to this position, I was a postdoc at the <a
href="https://www.gsb.stanford.edu/faculty-research/centers-initiatives/sil">Golub Capital Social Impact
Lab</a> led by Prof. <a href="https://www.gsb.stanford.edu/faculty-research/faculty/susan-athey"> Susan
Athey</a> at the Stanford Graduate School of Business.
My research focused on the design and analysis of adaptive experiments such as <b>bandit algorithms</b>.
This work led to collaborations with the World Bank to<a
href="https://blogs.worldbank.org/en/impactevaluations/can-counseling-increase-uptake-modern-contraceptives-part-i">
improve contraceptive uptake </a>in developing countries,
<a href="https://www.nyc.gov/site/opportunity/portfolio/behavioral-design-team.page">increase parking fee
resolution</a> in New York City, among others.
I was also a core developer on the R/C++ package <a href="https://github.com/grf-labs/grf">grf</a> for
nonparametric causal
inference based on random forests.
</p>
<p> I hold a <b>PhD in Economics</b> from <a href="https://www.bc.edu/">Boston College</a>. My advisors were <a
href="http://economics.emory.edu/home/people/faculty/biography/hoderlein-stefan.html">Stefan Hoderlein</a>, <a
href="https://www.bc.edu/bc-web/schools/mcas/departments/economics/people/faculty-directory/arthur-lewbel.html">Arthur
Lewbel</a> and <a href="https://sites.bc.edu/utku-unver/">Utku Ünver</a>.
My <a href="https://core.ac.uk/download/pdf/199470566.pdf">dissertation</a> was about using bandit algorithms to
improve
the performance of <b>kidney exchange</b> pools in the US.
</p>
<!-- Journal articles -->
<div class="docs-section" id="journal">
<h6 class="docs-header">Journal and conference articles</h6>
<ul>
<p class="title">Can personalized digital counseling improve consumer search for modern contraceptive methods?
</p>
<p class="authors">Susan Athey, Katy Bergstrom, <b>Vitor Hadad</b>, Julian C Jamison, Berk Özler, Luca
Parisotto, Julius Dohbit Sama [alphabetically]</p>
<p class="link"><a href="https://www.science.org/doi/10.1126/sciadv.adg4420">Science Advances</a> | 2023</p>
</ul>
<ul>
<p class="title">Adapting to Misspecification in Contextual Bandits with Offline Regression Oracles</p>
<p class="authors">Sanath Kumar Krishnamurthy, <b>Vitor Hadad</b>, Susan Athey</p>
<p class="link"><a href="https://proceedings.mlr.press/v139/krishnamurthy21a/krishnamurthy21a.pdf">ICML</a> | <a
href="https://arxiv.org/abs/2102.13240">arXiv</a> | <a
href="https://github.com/gsbDBI/mab_inference">GitHub</a> | 2021</p>
</ul>
<ul>
<p class="title">Confidence Intervals for Policy Evaluation in Adaptive Experiments</p>
<p class="authors"><b>Vitor Hadad</b>, David A. Hirshberg, Ruohan Zhan, Stefan Wager, Susan Athey</p>
<p class="link"><a href="https://www.pnas.org/doi/10.1073/pnas.2014602118">PNAS</a> | <a
href="https://arxiv.org/abs/1911.02768">arXiv</a> | 2021</p>
</ul>
<ul>
<p class="title">Off-Policy Evaluation via Adaptive Weighting with Data from Contextual Bandits</p>
<p class="authors">Ruohan Zhan, David A. Hirshberg, <b>Vitor Hadad</b>, Susan Athey</p>
<p class="link"><a href="https://dl.acm.org/doi/10.1145/3447548.3467456">KDD</a> | <a
href="https://arxiv.org/abs/2106.02029">arXiv</a> | <a
href="https://github.com/gsbDBI/contextual_bandits_evaluation">GitHub</a> | 2021</p>
</ul>
<ul>
<p class="title">Tractable Contextual Bandits Beyond Realizability</p>
<p class="authors">Sanath Kumar Krishnamurthy, <b>Vitor Hadad</b>, Susan Athey</p>
<p class="link"><a
href="https://proceedings.mlr.press/v130/kumar-krishnamurthy21a/kumar-krishnamurthy21a.pdf">AISTATS
(poster)</a> | <a href="https://arxiv.org/abs/2010.13013">arXiv</a> | 2021</p>
</ul>
<!-- Preprints -->
<div class="docs-section" id="preprints">
<h6 class="docs-header">Preprints and others</h6>
<ul>
<p class="title">Contextual Bandits in a Survey Experiment on Charitable Giving: Within-Experiment Outcomes
versus Policy Learning</p>
<p class="authors">Susan Athey, Undral Byambadalai, <b>Vitor Hadad</b>, Sanath Kumar Krishnamurthy, Weiwen
Leung, Joseph Jay Williams [alphabetically]</p>
<p class="link"><a href="https://arxiv.org/abs/2211.12004">arXiv</a> | <a
href="https://github.com/grf-labs/sufrep">GitHub</a> | 2022</p>
</ul>
<ul>
<p class="title">Shared Decision-Making: Can Improved Counseling Increase Willingness to Pay for Modern
Contraceptives?</p>
<p class="authors">Susan Athey, Katy Bergstrom, <b>Vitor Hadad</b>, Julian C. Jamison, Berk Özler, Luca
Parisotto, Julius Dohbit Sama [alphabetically]</p>
<p class="link"><a
href="https://www.gsb.stanford.edu/faculty-research/working-papers/shared-decision-making-can-improved-counseling-increase-willingness">Preprint</a>
| 2021</p>
</ul>
<ul>
<p class="title">Sufficient Representations for Categorical Variables</p>
<p class="authors">Jonathan Johannemann, <b>Vitor Hadad</b>, Susan Athey, Stefan Wager</p>
<p class="link"><a href="https://arxiv.org/abs/1908.09874">arXiv</a> | <a
href="https://github.com/grf-labs/sufrep">GitHub</a> | 2018</p>
</ul>
<ul>
<p class="title">Essays in Econometrics and Dynamic Kidney Exchange</p>
<p class="authors"><b>Vitor Hadad</b></p>
<p class="link"><a
href="https://dlib.bc.edu/islandora/object/bc-ir%3A107962/datastream/PDF/download/citation.pdf">Doctoral
Dissertation</a> | 2018</p>
</ul>
<ul>
<p class="title"> Increasing the uptake of long-acting reversible contraceptives among adolescents and young
women in Cameroon</p>
<p class="authors">Susan Athey,<b>Vitor Hadad</b>, Julian Jamison, Berk Özler, Luca Parisotto
[alphabetically]</p>
<p class="link"><a
href="https://aea-registry-production-documents-us-east-2.s3.us-east-2.amazonaws.com/ih9dt46idomn8nzoafklfmon17af?response-content-disposition=inline%3B%20filename%3D%22HGOPY_Pre_analysis_plan_Final_210323.pdf%22%3B%20filename%2A%3DUTF-8%27%27HGOPY_Pre_analysis_plan_Final_210323.pdf&response-content-type=application%2Fpdf&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAJJXKOU3VTOAOBH5Q%2F20250412%2Fus-east-2%2Fs3%2Faws4_request&X-Amz-Date=20250412T041210Z&X-Amz-Expires=300&X-Amz-SignedHeaders=host&X-Amz-Signature=20b2201cdfbb029b86da964af2b49913bd0ac4604b2734da7ec6139fd44cafef">Pre-analysis
plan</a> | 2021</p>
</ul>
</div>
<!-- Software -->
<div class="docs-section" id="software">
<h6 class="docs-header">Software</h6>
<ul>
<p class="title"><code>grf</code> — Causal inference based on generalized random forests</p>
<p class="authors">R/C++ package. Based on Wager, Tibshirani, and Athey (2019, Annals of Statistics)</p>
<p class="link"><a href="https://github.com/grf-labs/grf">GitHub</a> | <a
href="https://grf-labs.github.io/grf/">Docs</a></p>
</ul>
<ul>
<p class="title"><code>sufrep</code> — Encoding categorical variables via sufficient representations</p>
<p class="authors">R package. Based on Johannemann, Hadad, Athey, and Wager (2018)</p>
<p class="link"><a href="https://github.com/grf-labs/sufrep/">GitHub</a></p>
</ul>
</div>
</div>
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