Skip to content Skip to main navigation Report an accessibility issue

ISSE Directory

Research Staff

Mingzhou Jin
John D. Tickle Professor, Professor and Associate Head of Industrial & Systems Engineering, and ISSE Director

modeling and analysis for environment, sustainability and climate change; logistics, transportation, and supply chain management (LTS lab director); operations research and data analytics; advanced manufacturing
Websites:  and

Jason Brown
Research Associate II

environmental monitoring technology, stream restoration, water quality modeling, watershed management and environmental chemistry

Chien-fei Chen
Research Associate Professor 
Director of Energy and Environmental Justice

environmental sociology, pro-environmental behavior, renewable energy adoption, energy justice

Tim Ezzell
Assistant Research Professor

Appalachian development, rural sustainability, historic preservation, participatory planning, sustainable tourism

Tim Gangaware
Research Director, Tennessee Water Resources Research Center

water resources, erosion prevention and sediment control, stormwater management, hydrologic determination

Terry Hazen
Governor’s Chair and Methane Center Director
Methane Center

bioremediation, microbial ecology, climate change, systems engineering


Steven Hoagland
Research Associate II

Appalachian Community Technical Assistance and Training Program, water distribution systems analysis, hydrologic and hydraulic modeling

Nawei Liu
Research Associate 

alternative fuel refueling infrastructure modeling, electric vehicle research, and transportation modeling

Jiafu Mao
ORNL Joint Faculty Professor 

understanding hydrology, carbon cycling, and vegetation dynamics in the Earth terrestrial ecosystems using field measurements, satellite data, process-oriented land surface and Earth system models

Jonathan Overly
Director, East Tennessee Clean Fuels

alternative fuel vehicle technology adoption, fleet, outreach, education, grant assistance, program management, natural gas, electric, propane, biodiesel, ethanol, EV, electric vehicles

John Schwartz 
Professor of Civil & Environmental Engineering and 
Director of Tennessee Water Resources Research Center

watershed management, water quality analysis, river mechanics, fluvial geomorphology, stream restoration, ecological engineering, ecological assessment 

Danniel Siksay
Chief of Staff, East Tennessee Clean Fuels

alternative fuel vehicle technology adoption 

Ian Simpson
Research Associate III

stormwater management, water resources, hydrology, nonpoint source pollution, green infrastructure, ecological engineering


Sheila Webster
Program Manager

DOE health and safety worker training

Catherine Wilt
Research Associate

sustainable development, social justice, sustainable regional systems

Yulong Zhang
Assistant Research Professor

wildfire modeling, remote sensing of vegetation dynamics, carbon and water coupling, earth system modeling



Support Staff

Kellie Caughorn
Administrative Assistant, Tennessee Water Resources Research Center

Madelyn Collins
Program Coordinator, East TN Clean Fuels

Lissa Gay
ISSE Communications Director

Ainsley Kelso
Communications Coordinator, East TN Clean Fuels

Jennie Kidd
Program Coordinator, East TN Clean Fuels

Bonnie Morris
Tennessee Water Resources Research Center

Savannah Robertson
DriveElectricTN Coordinator, East TN Clean Fuels

Sherry Russell
Business Manager