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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<link href="docs.css" rel="stylesheet">
<title>Martin Holmer profile</title>
</head>
<body>
<h1>Martin Holmer</h1>
<h3>Background</h3>
<p>
I have a Ph.D. in economics from MIT and decades of experience
designing, developing, testing and using microsimulation models that
estimate the effects of changes in public policy.
</p>
<p>
From 2015 to 2019, I was the lead developer
of <a href="https://github.com/PSLmodels/Tax-Calculator"
target="_blank">Tax-Calculator</a>, an open-source static US federal
income and payroll tax microsimulation model written in Python. In
2018, the World Bank asked me to begin working with the Tax Policy
Research Unit of the Ministry of Finance in New Delhi to adapt
Tax-Calculator to simulate the Indian individual income tax.
</p>
<p>
My experience working with World Bank staff in Washington and
Ministry of Finance staff in New Delhi has led to the development of
an open-source tax microsimulation
<a href="https://chiselapp.com/user/PSG/repository/Tax-Analyzer-Framework"
target="_blank">framework</a> that supports rapid development with
minimal coding of new tax models that can be used at the command line
without any computer programming. There is also a graphical user
interface to framework models. This framework has been used to
develop a US federal income and payroll tax model and a
Massachusetts state income tax model. Also, the framework
has been used to develop personal and corporate income tax models
for several countries including India, Malaysia, Albania, Moldova,
and Ethiopia.
</p>
<p>
Over several decades before 2016, I designed and developed, for use
by federal government agencies and non-profit organizations, a suite
of dynamic microsimulation models — known as the PSG Models
— that simulate payroll taxes and social security benefits as
well as lifetime accumulations of employer-sponsored pension
benefits. The models are written in C++ and have a graphical user
interface that facilitates their use.
</p>
<h3>Services</h3>
<p>
I can provide design advice, development assistance, validation
testing or ease-of-use evaluation related to your microsimulation
model. The consulting engagement can have a narrow or broad focus,
and be short-term or long-term, depending on your needs. To discuss
options, contact me via email at martin DOT holmer AT gmail DOT com.
</p>
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</body>
</html>