Lenny Winkel investigates the environmental behaviour of selenium and other trace elements – such as arsenic – that can affect health. She conducts research into sources, pathways and sinks of naturally occurring selenium and explores the production of volatile forms of selenium by marine phytoplankton. She also examines the deposition of atmospherically transported selenium in the soil, providing an insight into the role climate plays in the abundance of selenium in the soil. Lenny Winkel also makes a substantial and committed contribution to teaching in the Department of Environmental Systems Science at ETH Zurich.