He subsequently pursued a doctoral degree at the Department of Occupational and Environmental Medicine, National Heart and Lung Institute, University of London, United Kingdom, from 1989 to 1993.
His academic journey included a postdoctoral stint at the University of California, Davis, from 1994 to 1996, followed by a faculty position at Imperial College London, where he served from 1996 to 2006.
Since 2007, he has held the position of research professor at ISGlobal, formerly known as the Centre for Environmental Epidemiology (CREAL), based in Barcelona, Spain.
[1] Nieuwenhuijsen has edited eight books related to environmental exposure assessment and epidemiology, urban and transport planning, and health.
He also leads the bi-annual Urban Transitions conference and holds the position of Editor in Chief at Environment International.