Stephanie J. London is an American epidemiologist and physician-scientist specializing in environmental health, respiratory diseases, and genetic susceptibility.

[3] London began work on genetic susceptibility to respiratory disease in 1990 with a population-based case-control study of lung cancer in African-Americans and Caucasians in Los Angeles County.

With collaborators on a cohort of Shanghai men she published the first example of gene-diet interaction based on a dietary biomarker; isothiocyanates, a chemopreventive substance in Brassica vegetables, were protective for lung cancer only among individuals with genetically reduced ability to eliminate these compounds.

After coming to NIEHS in 1995, she developed a case-parent triad study of genetics of childhood asthma in Mexico City (MCCAS).

[1] Under London's direction, the CHARGE Pulmonary Group recently identified over 50 new lung function loci in a large multi-ethnic meta-analysis.

To extend her asthma findings in MoBa London developed a sub-study of genome wide methylation in newborns using the Illumina 450K platform.

This study, now widely replicated, identified numerous novel loci differentially methylated in response to maternal smoking in pregnancy.

London co-led a large meta-analysis identifying the extensive newborn methylation signature of gestational age at birth.