Dr. Martin Grell graduated with a PhD from the University of Darmstadt in 1994 and subsequently worked as a researcher at Bangor and Sheffield Universities, as well as the Max Planck Institute for Polymer Research. From September 2000 to August 2019, he served as an academic at the University of Sheffield, UK. His research focused on organic and other solution-processed electronic and photonic devices, particularly thin-film transistors and optical sensors. Since September 2019, he has been working as a consultant, currently collaborating with Riyadh, Taif, and Tabuk Universities in Saudi Arabia, and Chuka University, Kenya, where he also holds an external chair. His recent work is primarily focused on sensor devices, mainly in aqueous media