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Office Structure and Staff

William Hohenstein
Director
202-720-6698
william.hohenstein@usda.gov



Teresa M. Pickett Wade
Secretary
202-720-0450
teresa.pickett@usda.gov



Anthony Radich
202-401-0532
tony.radich@usda.gov

Tony Radich is an Agricultural Economist with the Office of Energy and Environmental Policy. He focuses on analysis of biofuels markets and the biobased economy. He also reviews all Environmental Protection Agency regulations that pertain to biofuels, including the Renewable Fuel Standard, vehicle fuel economy standards, and liquid fuels specifications. Prior to joining USDA in 2016, Tony worked for 15 years at the U.S. Energy Information Administration, where he covered fuel ethanol and biodiesel markets. He contributed to the Annual Energy Outlook, the Short-Term Energy Outlook, and helped to launch the Biodiesel Production Survey. Tony holds an B.A. in Economics and Business, a BS in Mechanical Engineering, and a PhD in Economics.



Celia Hernandez
202-401-0463
celia.hernandez@usda.gov

Ms. Hernandez is a Fellow for the Office of Energy and Environmental Policy. Ms. Hernandez serves as a program assistant, finance liaison, and provides research support to senior Economist. She previously worked for USDA’s Office Program and Budget Analysis. Ms. Hernandez graduated from the University with a B.A. in Economics.



Christopher G. Hartley 
202-690-0832
chris.hartley@usda.gov

Dr. Hartley is responsible for the development of policy, tools, and metrics to facilitate private investment in conservation and the participation of farmers, ranchers and forest landowners in emerging environmental markets. Dr. Hartley recently served on assignment to the Office of the Deputy Undersecretary for Research Education and Economics, first as the Acting Administrator for the Economic Research Service and then as a Senior Advisor to the Mission Area. He previously worked for the Natural Resources Conservation Service in Washington, DC and in California and served with the U.S. Peace Corps as an agricultural extension agent in Senegal, West Africa. He is a Certified Crop Advisor, and a licensed Pest Control Advisor. Dr. Hartley attended the University of California at Davis, Davis, CA and holds a Ph.D. Ecology, emphasis Agroecology, M.Sc. Agronomy, MSc. International Agricultural Development.



Irene Xiarchos
202-815-0588
irenemargaret.xiarchos@usda.gov

Irene Margaret Xiarchos is a Senior Economist with the Office of Energy and Environmental Policy. She has a PhD in Natural Resource Economics, and a long career in research and policy, evaluating the intersection of energy with agriculture, the environment, and rural development. She is responsible for the GHG estimates from energy use in agriculture, and explores opportunities for sustainable development with a focus in resource management, infrastructure, value chains, markets and trade.



Jan K. Lewandrowski
202-720-6699
jan.lewandrowski@usda.gov

Jan Lewandrowski is a Senior Economist in the Office of Energy and Environmental Policy. Jan directs analysis of economic and technical issues related to the agriculture and forest sectors in the areas of climate change adaptation and mitigation, the greenhouse gas implications of renewable fuels, and land use change.



Kathryn L. Zook
202-690-3592
kathryn.zook@usda.gov



Mindy Selman
202-401-0531
mindy.selman@usda.gov

Mindy Selman is a Senior Analyst with the Office of Energy and Environmental Policy. Her areas of expertise include environmental markets (with a focus on water quality and carbon markets) as well as other market-based mechanisms for promoting conservation, conservation metrics, and farm-scale tools for estimating environmental benefits. Ms. Selman leads the development of the Nutrient Tracking Tool (NTT), a farm-scale tool for estimating nutrient and sediment losses from crop and pasture lands.



Margaret Walsh
202-720-9978
Margaret.walsh@usda.gov

Dr. Margaret Walsh is OEEP’s Senior Ecologist, focusing on Climate Assessment, Scientific Analysis, Decision-Support Tool Development, International Science, Food Systems and Security, and Sustainability.



Vanessa Brown-Harrod
202-720-4793
vanessa.brown-harrod@usda.gov

Mrs. Brown-Harrod is an Administrative Officer for the Office of the Chief Economist under the Office of Energy and Environmental Policy. Mrs. Brown-Harrod serves as an Administrative Officer responsible for providing budget execution, interagency agreements, cooperative agreements invoicing, purchasing and contract award support to the Office of the Chief Economist and division staff offices. She previously worked for 13 years with USDA, Foreign Agricultural Service serving as a program assistant. Mrs. Brown-Harrod graduated from the University of Maryland Global Campus formerly known as (University of Maryland University College) with a B.S. in Information Technology Services.



Wes L. Hanson
202-401-0846
wes.hanson@usda.gov

Wes Hanson joined OEEP’s Climate Change Program Office as an Agricultural Economist in 2018. His work focuses on improving greenhouse gas emission estimates in the agricultural sector and providing economic and environmental analysis of renewable energy systems. Wes also oversees updates to the U.S. Agriculture and Forestry Greenhouse Gas Inventory, and USDA’s Quantifying Greenhouse Gas Fluxes in Agriculture and Forestry: Methods for Entity-Scale Inventory report. Wes is an alumnus of the Presidential Management Fellows program, and a member of the Presidential Management Alumni Association. Before joining USDA, Wes served in the United States Air Force as an Integrated Avionics Systems Instrument and Flight Controls technician on the B-2 Stealth Bomber. Mr. Hanson attended the University of Maryland in 2018 and graduated with an MPP in Environmental Policy, University of Maryland and attended Linfield College in 2016 graduating with a B.A. in Environmental Studies.