Mahyar is an urban ecologist who studies the relationship between spatiotemporal patterns and environmental performance of cities towards generating knowledge that can be used to optimize the spatial pattern of cities, including of green infrastructure for enhanced environmental functioning. His other area of research is environmental justice and examining health impacts of alternative patterns of urban development. His current research looks at assessing the ability of green infrastructure to manage stormwater and mitigate elevated temperature in Southeast Asian cities. Prior to this, he was assistant professor at the Malaysian campus of University of Reading and then postdoctoral research fellow at the Natural Capital Singapore project with aim to assess the benefits that nature in Singapore provides, followed by their economic and societal valuation. His PhD at the National University of Singapore was focused on the relationship between spatial pattern and cooling effect of cities.