Dr. Johan Kuylenstierna has been Director of SEI York since 1997 and has worked for SEI since it began in 1989.
His research has been concerned with various aspects of air pollution at scales ranging from regional to global, particularly effects of acidifying deposition, eutrophying nitrogen deposition and gaseous pollutant impacts on crops, forests and human health.
He has been developing methods to map sensitivity, critical load/level and exceedance maps for sulphur, nitrogen and ozone pollution in Europe, Asia, Africa and South and Central America, and also assessments at global scale. He has been collaborating with researchers and policy makers in all these regions.