EPI Team

The Environmental Performance Index is a joint project of the Yale Center for Environmental Law & Policy and The Center for International Earth Science Information Network (CIESIN) at Columbia University’s Earth Institute. The EPI is produced in collaboration with the World Economic Forum (WEF).

Lead Authors

Zachary A. Wendling
Principal Investigator
Yale Center for Environmental Law & Policy
Marc A. Levy
Deputy Director
Daniel C. Esty
Yale Center for Environmental Law & Policy
Alex de Sherbinin
Senior Research Associate
John W. Emerson
Adjunct Professor of Statistics
Director of Graduate Studies
Department of Statistics and Data Science
Yale University


School of Forestry & Environmental Studies, Yale University

Natalie R. Spiegel

Valerie Pinkerton

Lauren Boucher

Stephanie Ratté

Sam Mardell

Mai Ichihara

Yale College
Joseph Battles
Department of Engineering and Public Policy, Carnegie Mellon University
Amanda N. Quay

Data Programming

Department of Statistics and Data Science, Yale University

Sunnie Suhyoung Kim

Elena Khusainova

Jessica Gao

Shylee Ezroni

Wan Jiang

Geospatial Analysis

Center for International Earth Science Information Network, Columbia University

Malanding Jaiteh
Senior Research Associate

Tricia Chai-Onn
Senior Research Associate

Visual Design

School of Architecture, Yale University

Rashid Muydinov*

Erin Hyelin Kim

Robert Smith Water

* Joint with School of Forestry & Environmental Studies, Yale University

Office of the University Printer, Yale University

Maura Gianakos
Project Coordinator

Yale Printing & Publishing Services

Gregg Chase
Graphic Designer


Cardinal Analytics and Planning Associates
David C. Warren

Website Design

School of Forestry & Environmental Studies, Yale University

Michael Slattery
Web Developer

Matthew Garrett
Director of Communications and Web Operations

Expert Contributors

Center for Governance and Sustainability, John W. McCormack Graduate School of Policy and Global Studies, University of Massachusetts Boston

Maria Ivanova
Director, Associate Professor in the Department of Conflict Resolution, Human Security, and Global Governance

Department of International Business, Universidad EAFIT Medellín (Colombia)
Natalia Escobar-Pemberthy

Assistant Professor, Research Associate for the Center for Governance and Sustainability

The Nature Conservancy
School of Forestry & Environmental Studies, Yale University
Stephen Wood
Australian Rivers Institute, Griffith University
Vanessa Reis

Expert Advisers

Commonwealth Scientific and Industrial Research Organisation (CSIRO)

Simon Ferrier
OSE Science Leader, CSIRO Land & Water

Tom Harwood
Senior Research Scientist, CSIRO Land & Water

Andrew Hoskins
Postdoctoral Fellow

Institute for Health Metrics and Evaluation

Kara Estep
Senior Research Manager

Joey Frostad

Caleb Irvine
Post-Bachelor Fellow

Map of Life

Walter Jetz
Associate Professor of Ecology and Evolutionary Biology and of Forestry and Environmental Studies

Sea Around Us

Daniel Pauley
Principal Investigator

Deng Palomares
Senior Scientist and Project Manager

Gordon Tsui
Research Assistant

University of Maryland

Xin Zhang
Assistant Professor, Center for Environmental Science

World Economic Forum

Thierry Geiger
Head, Research and Regional Impact, Future of Economic Progress

World Resources Institute

Mikaela Weisse
Research Analyst, Global Forest Watch

Johannes Friedrich
Senior Associate, Global Climate Program

Mengpin Ge
Research Analyst, Global Climate Program


Jane W. Zhang, Yale College

John Gambell, Yale University Printer

Lisa Dale, Earth Institute, Columbia University

Rich Fuller, Pure Earth