People
Faculty
![Martin Stephens Martin Stephens](/sites/default/files/styles/people_card_360/public/images/2550.jpg?h=bf372811&itok=zUTRnt2W)
Senior Research Associate
Environmental Health and Engineering
Martin Stephens, PhD, promotes new methods of biomedical research and testing that are more relevant to human health than are traditional animal-based approaches.
![close up of man wearing glasses looking away from camera](/sites/default/files/styles/people_card_360/public/2022-05/alan-stone.jpeg?h=5e6d932b&itok=KSzvQt_8)
Professor
Environmental Health and Engineering
Alan employs chemistry foundations to biogeochemical processes to address issues of anthropogenic chemicals in the environment and engineered systems.
![Katya Tsaioun Katya Tsaioun](/sites/default/files/styles/people_card_360/public/images/3222.jpg?h=2a479378&itok=hp44oSb3)
Assistant Scientist
Environmental Health and Engineering
Katya Tsaioun, PhD, MS, leads international multi-stakeholder efforts to establish evidence-based methodologies and practices in translational research to inform regulatory decisions.
![Marsha Wills-Karp Marsha Wills-Karp](/sites/default/files/styles/people_card_360/public/images/946.jpeg?h=852176a3&itok=Ipdxo19R)
Professor
Environmental Health and Engineering
Marsha Wills-Karp, PhD, researches the environmental determinants of allergic and immune diseases across the lifespan and chairs the Department of Environmental Health and Engineering.