Ehud is an expert in pattern formation theory, with particular emphasis on front dynamics. He has contributed significantly to the understanding of front dynamics in activator–inhibitor systems and periodically forced oscillatory systems, elucidating the roles that front instabilities play in initiating and sustaining complex spatiotemporal patterns. Throughout his research, he has collaborated with leading experimentalists to test theoretical predictions in controlled laboratory experiments, primarily involving reaction-diffusion systems. Subsequently, Ehud applied his expertise to vegetation pattern formation in drylands, desertification fronts and invasion fronts, drawing on concepts and tools from nonlinear physics and collaborating with ecologists. He has made pioneering contributions to the modeling and understanding of the positive feedback loops that drive vegetation pattern formation, the multitude of regular, localized, and irregular patterns that emerge along environmental gradients, and their implications for biodiversity and ecosystem function. His current research focuses on understanding complex ecosystem responses to climate change, integrating stress-adaptation mechanisms across multiple levels of ecological organization, including phenotypic plasticity, spatial vegetation patterning, and plant community reassembly. Ehud is the author of the monograph Nonlinear Physics of Ecosystems (CRC 2015).