USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Site Notification

Site Notification

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Staff - Energy Analysis and Sustainability

Meet some of our staff in the Energy Analysis and Sustainability Division.

David A. Arthur, PE

David A. Arthur, PEChief of Energy Analysis and Sustainability
MEng Automotive Engineering, University of Michigan
BS Mechanical Engineering, Pennsylvania State University
Phone: 617-494-2606

As chief of the Energy Analysis and Sustainability Division, David Arthur manages over a dozen highly specialized technical research staff leading or supporting projects in sources, uses, and assurance of transportation energy. Arthur is also a CMMI organizational process leader for the Volpe Center and the lean process improvement lead for the Volpe Business Enterprise Office.

Arthur provided support to the U.S. Air Force, where Volpe created a decision-making tool that analyzed numerous energy architectures/strategies for Beale Air Force Base. Arthur also provided similar support to the Hampton Roads region, where Volpe developed an economic model for assessing impacts from recurrent flooding and extreme weather to the transportation infrastructure.

In addition to overseeing resilience projects, Arthur provides automotive engineering expertise to National Highway Traffic Safety Administration (NHTSA)-sponsored projects on automotive safety and software. Arthur has co-authored numerous publications—including reports on wireless power transfer and the functional safety of steer-by-wire, brake/traction, and electric power-steering systems—and has moderated panels including a session at a past CERV conference.

Prior to joining Volpe in 2012, Arthur spent 14 years in the private sector, where he was an inventor or co-inventor on 23 patents in the areas of hydrogen fuel cells and battery hybridization strategies. Arthur was also a program chief engineer at United Technologies for an automotive fuel cell program and a stationary flow battery energy storage program for micro-grids. At General Motors, Arthur spent 11 years in various roles, including as lead systems engineer on the fuel cell program, as a regenerative braking engineer for the EV1 electric vehicle, and as a chassis engineer for the Precept hybrid-electric vehicle

View David Arthur’s LinkedIn profile.

Andrew Breck

Environmental Protection Specialist
MF Forestry, Yale University School of Forestry and Environmental Studies
BA East Asian Studies, Wesleyan University
Phone: 617-494-2213

Andrew Breck joined Volpe in 2011. Applying a dual background in the natural and social sciences, he analyzes data to support strategic decisions, plans, and policies for a variety of customers. His work addresses diverse topics, including sustainability, energy, safety, resiliency, and social equity. Breck currently works primarily on high-performance sustainable buildings and other resource efficiency topics for the Maritime Administration, alternative fuels and vehicles for the Federal Highway Administration (FHWA), data quality for the Federal Motor Carrier Safety Administration (FMCSA), and planning and asset management for the National Park Service (NPS).

Breck has also developed resource management plans for a variety of clients, proposing options and weighing the costs and benefits of each approach. His analyses focus on monetary as well as non-monetary costs and benefits, such as ecosystem services and social outcomes. One example of a relevant transportation application for this type of analysis is assisting transportation agencies in evaluating methods for managing the right-of-way real estate that they own and maintain for safety, aesthetics, asset preservation, and other desired values. 

Stephen Costa

Stephen Costa

Technical Analyst
MA Energy and Environmental Analysis, Boston University
BS Environmental Science, University of Massachusetts Amherst
Phone: 617-494-3852

Stephen Costa supports a variety of projects focused on the role of transportation as both an element of energy supply and end-use. These include interagency collaborations to advance the production, transport, and distribution of alternative fuels, as well as the expansion of alternative fuel infrastructure and end-use adoption of alternative fuel and advanced energy technology vehicles. His recent efforts have assisted programs and initiatives at DOT’s Office of the Assistant Secretary for Research and Technology, the U.S. Department of Energy’s (DOE) Vehicle Technologies and Bioenergy Technologies Offices, the Federal Highway Administration, and other DOT modal administrations and state agencies.

Before joining Volpe in 2006, Costa worked at U.S. DOE for over 6 years. There he supported and led a range of energy efficiency and alternative fuel programs targeted to public and private partners in fleet management, building administration, and domestic manufacturing, as well as general public consumers.

Costa was awarded a DOT Secretary’s Award for Excellence for his demonstrated leadership, breadth of knowledge, and extensive efforts in promoting Departmental initiatives on energy security and environmental stewardship in 2008.

View Stephen Costa’s LinkedIn profile.

Alexander K. Epstein, PhD

Alexander K. Epstein, PhDGeneral Engineer
PhD Engineering Sciences, Harvard University
SM Applied Physics, Harvard University
BS Engineering, Olin College
Phone: 617-494-2539


Dr. Alexander Epstein joined the Volpe Center in 2011, where he oversees transportation energy sustainability and vehicle-based safety projects spanning local, state, and federal transportation agencies. Dr. Epstein leads a portfolio of vehicle innovation research and implementation initiatives with public- and private-sector fleets, develops industry/nonprofit partnerships to demonstrate and assess technologies, and leads or supports coordinated research in support of FMCSA, NHTSA, and other DOT operating administrations, linking local deployment with federal stakeholders and best practices. Dr. Epstein directly supports a number of Vision Zero initiatives across the U.S. to reduce vulnerable road user and other traffic fatalities, as well as fleet, airport, and other building decarbonization initiatives.

Current focus areas include partnering with fleet operators to develop a Safe Fleet Transition Plan framework to systematically identify, prioritize, and implement fleet-level safety best practices; and advancing development and use of the Clean Fleet Transition Tool for optimizing future fleet emissions targets and achievable implementation roadmaps. Previously, Dr. Epstein helped apply a risk-based decision tool for U.S. Air Force energy resilience that informed energy architectures and strategies at Beale AFB; and led development of an open-source climate data scenario planning and analysis tool now widely adopted by the National Park Service.

Dr. Epstein is a two-time recipient of the DOT Secretary’s Award, and in 2016, he received the Federal Laboratory Consortium’s Excellence in Technology Transfer Award—DOT’s first in seven years.

View Alexander Epstein’s LinkedIn profile.

Dan F.B. Flynn, PhD

Alexander K. Epstein, PhD

Data Scientist
PhD Ecology, Evolution, and Environmental Biology, Columbia University
BA Biology, Oberlin College
Phone: 617-494-3665

Dr. Dan Flynn is a data scientist with 15 years of experience in quantitative research on transportation safety, land use, and environmental science. His research projects span across modes, using statistical tools to derive insights from and create compelling visualizations of complex data sets.

Dr. Flynn supports the Office of the Undersecretary for Policy at DOT to pilot machine learning and predictive modeling of police-reportable crashes in near real-time using crowdsourced data. He also serves as a technical lead for the development of an innovative statistical model to assess the safety of motor carriers in the United States for the Federal Motor Carrier Safety Administration. 

Prior to joining Volpe, Dr. Flynn was a research scientist in sustainability and global change, working at Harvard University, the University of Zurich, and the Chinese Academy of Sciences. He has taught courses on environmental science, sustainable energy solutions, and data science solutions using open-source statistical programming languages.

Peter Herzig

Peter HerzigEnvironmental Protection Specialist
MS Environmental Studies, Antioch University New England
BA Peace and Justice Studies, Tufts University
Phone: 617-494-2406

Peter Herzig joined Volpe in 2014 as a student intern and joined the Energy Analysis and Sustainability Division as an environmental protection specialist later that year. Since joining the division, Herzig has provided technical and coordination support for the Commercial Aviation Alternative Fuels Initiative (CAAFI) as the program specialist. Herzig also provides geospatial analysis and project management support for a variety of transportation infrastructure projects. He is an active participant in Volpe’s Green Week, and led the 2015 winning Innovation Challenge team that proposed a visualization and screening tool designed to help U.S. DOT and other agencies efficiently integrate national social and transportation data into planning and operations to ensure that transportation and other public services are available to all users in all communities. Herzig also manages multiple projects through his role as a contracting officer’s representative.

Prior to joining Volpe, Herzig worked on a number of projects aimed at the corporate adoption of responsible business practices for a more sustainable global economy. Herzig is a Marine Corps veteran, having served in Iraq as an intelligence analyst and a security specialist at the U.S. Embassies in Zambia, the Dominican Republic, and Turkey.

Kirby Ledvina

Kirby LedvinaGeneral Engineer
MS Civil and Environmental Engineering (Concentration in Systems Engineering), Massachusetts Institute of Technology
BS Management Science, BS Economics, Massachusetts Institute of Technology
Phone: 617-494-3524

Kirby Ledvina joined Volpe’s Energy Analysis and Sustainability Division in 2021 after interning with the division the previous summer. She supports diverse projects in the areas of sustainability, supply chain optimization, and transportation asset management.

Prior to Volpe, Ledvina was a graduate research assistant with the MIT Data Science Lab, where she designed and computationally tested customer-sharing schemes for delivery vehicle routing. Previously, Ledvina also supported research in environmental economics and climate policy as a member of the MIT Joint Program on the Science and Policy of Global Change. Her work in modeling countries’ energy and emissions trajectories under the Paris Agreement was presented at COP24 in Katowice, Poland, in December 2018. Ledvina is an accredited LEED Green Associate and a certified Tableau Desktop Specialist.

Kristin C. Lewis, PhD

Kristin C. Lewis, PhDPrincipal Technical Advisor, Energy Analysis and Sustainability
PhD Organismic and Evolutionary Biology, Harvard University
BS Chemistry and Environmental Studies, Yale College
Phone: 617-494-2130


Dr. Kristin Lewis is the principal technical advisor for energy analysis and sustainability at the U.S. DOT Volpe Center. Dr. Lewis joined Volpe in 2009 with a focus on resilience in transportation, alternative fuels, sustainability, and environmental impact risk assessments.

Read Dr. Kristin Lewis’s full bio.

Scott Lian

Scott Lian, General Engineer
BS Mechanical Engineering Technology, Northeastern
Phone: 617-494-2811

Scott Lian joined the Volpe Center in 2003, supporting safety codes and standards development for hydrogen as a transportation fuel and subsequent research, demonstration, and deployment activities of hydrogen fuel cell vehicles, including the Hydrogen Fuel Cell Bus Program. Products include a Fuel Cell Bus Lifecycle Cost Model.

Lian provides ongoing technical support for the deployment of alternative fuels in public transportation fleets serving the National Park Service (NPS), U.S. Fish and Wildlife Service (FWS), and state and local parks. He brings nearly two decades of expertise in vehicle technologies, fueling (or charging) systems, fleet operations, and safety. NPS support includes a technical analysis of alternative transit fleet fuels and transition strategies for battery-electric bus deployment at the Presidio National Historic Park; a guide for Alternative Transportation Systems (ATS) – Vehicles and Supporting Infrastructure; and a feasibility analysis for new fleet maintenance infrastructure at Cape Cod National Seashore. For FWS, Lian led an evaluation of commercially available electric low-speed vehicle trams.

As technologies and mobility continue to progress, Lian is supporting OST-R by leading a U.S. DOT Volpe Center team in a cross-departmental collaborative research initiative with partners at DOE’s National Renewable Energy Laboratory (NREL), examining automated, connected, efficient, and shared mobility systems while identifying gaps in research, metrics, and data. The project has forged strong collaborative relationships between Volpe and NREL staff, who are working together to consider the future transportation systems and their increasing connectedness between transportation and energy.

Gretchen Reese

Gretchen ReeseProgram Support Specialist
BS Business Administration, emphasis in Administrative Systems and Management, Concord University
Phone: 617-494-3193

Gretchen Reese joined the Volpe Center in 2020 as a program support specialist in the Energy Analysis and Sustainability Division. In this role, she administratively supports the division with general clerical tasks and planning. She also provides general support to specific projects within the division.

Reese joined Volpe after completing two years in the Peace Corps serving in northern Uganda. During her service in Uganda, she worked with her host organization to perform needs assessments and introduce projects to address the community’s identified needs. Her main project during service was perma-culture and nutrition to address the lack of availability and access to vegetables during the prolonged dry season of the region. Other projects she worked on include farming as a business, community health events, and literacy promotion in village schools.

Michael Scarpino

Mike ScarpinoTransportation Project Engineer
BS Mechanical Engineering, University of Maine
Phone: 617-494-3373

Michael Scarpino provides planning and management support for programs and activities that promote improved energy-related technologies and practices in the transportation sector. Since joining Volpe in 2013, his primary focus is providing support for inter-agency initiatives supporting fleets’ and end-users’ transition to alternative fuels and advanced vehicle technologies, as well as the development of the supporting fueling infrastructure. His current responsibilities involve providing technical and programmatic support for FHWA and DOE for various alternative fuel initiatives and activities, such as FHWA’s Alternative Fuel Corridor Designation Initiative and DOE’s Clean Cities Program. 

Prior to working for Volpe, Scarpino worked for 16+ years at DOE supporting the Clean Cities Program. Responsibilities included facilitating the efforts of the national Clean Cities coalition network to increase the use of alternative fuels and vehicles through the development of public-private partnerships. While serving as the team lead project manager, he oversaw the administration of a portfolio of projects and program support contracts totaling over $860 million in annual appropriations and American Recovery and Reinvestment Act (ARRA) funding for transportation-related projects.

Scarpino’s 30+ year federal career includes working for 12 years as a nuclear engineer for the Department of the Navy’s Portsmouth Naval Shipyard in New Hampshire and the Department of Energy’s Savannah River Site in South Carolina.

Erika A. Sudderth, PhD

Data Scientist
PhD Organismic and Evolutionary Biology, Harvard University
BS Biochemistry and Cell Biology (Minor in Environmental Studies), UC San Diego
Phone: 617-494-3128

Dr. Erika Sudderth joined Volpe in 2014 after completing post-doctoral research at Brown University and UC Berkeley. Her research combined field experiments, biochemical analysis, and statistical modeling to understand the effects of global change on ecosystem function. She also taught university courses in environmental statistics and biological computing.

At Volpe, Dr. Sudderth manages a variety of projects in the areas of data science and energy analysis. She leads teams that develop innovative analytical approaches for data initiatives that inform DOT policy and support traffic safety applications for state and local partners. Dr. Sudderth also supports the DOT Energy Resource and Efficiency Program and the Maritime Administration to meet federal energy efficiency targets and complete related reporting requirements. In addition, she has supported ARPAe renewable energy programs by assessing potential environmental effects of a new tidal energy technology, and transportation applications of novel solar energy technologies.

Shortly after joining Volpe, Dr. Sudderth helped develop dose-response relationships for effects of aircraft noise on National Park visitors as part of the Air Tour Management program for the Federal Aviation Administration and the National Park Service. 

Amity Wilczek, PhD

Amity WilczekStatistician
PhD Organismic and Evolutionary Biology, Harvard University
AB Biology, University of Chicago
Phone: 617-494-3887

Amity Wilczek, PhD joined the U.S. DOT Volpe Center’s Energy Analysis and Sustainability Division in 2021. She provides analytical and statistical expertise for a variety of projects, drawing on her background in natural and environmental sciences, mathematical and statistical modeling, and science communication and education. At the U.S. DOT Volpe Center, Wilczek’s work to date has focused on climate resilience (with the Energy and Resource Efficiency Program and the Federal Aviation Administration) and equity (with the Departmental Office of Civil Rights).

Prior to joining the U.S. DOT Volpe Center, Wilczek spent more than 20 years working as a researcher and educator. Her work on plant responses to changing environments has appeared in many scientific journals including Science, Proceedings of the National Academy of Sciences, Ecology, American Naturalist, and Philosophical Transactions of the Royal Society.  Wilczek’s teaching career started at Harvard and Brown before transitioning to Deep Springs College in eastern California, where she served for more than 10 years as Herbert Reich Chair of Natural Sciences, Academic Dean, and Vice President.

Kevin Zhang, PhD

Data Scientist
PhD Operations Research, Massachusetts Institute of Technology
BA Mathematics, BS Statistics, Yale
Phone: 617-494-3640

Dr. Kevin Zhang joined the U.S. DOT Volpe Center in 2020 as a data scientist in the Energy Analysis and Sustainability Division. He provides technical support on projects related to resilience of transportation networks, supply chain optimization, and roadway safety. He also provides support on a project modeling driving behavior in interactions between human-driven vehicles and connected and automated vehicles.

Prior to joining the Volpe Center, Zhang received a doctorate in operations research at MIT. His research focused on developing analytical models for the real-time calibration of traffic simulators. He also worked previously as an operations research analyst at an analytics consulting firm in Boston.

Matthew Pearlson

General Engineer
Phone: 617-494-3358

Last updated: Friday, February 25, 2022