[1] Her dissertation, Aggregate Data Methods for Relative Risk Parameter Estimation in Diet and Disease Prevention Research, was supervised by Ross L.
[4] Among her principal methodological/statistical contributions to the environmental health field are 1) developing statistical methods for aggregate data studies;[5][6][7] 2) developing measurement error correction methods for inference about health effects for applications to air pollution cohort studies;[8][9] 3) advancements in spatial and spatio-temporal modeling methods for air pollution exposures;[10][11] and 4) referent selection and analysis approaches for case-crossover study design for air pollution epidemiology.
[12][13] She has also helped advance scientific understanding of the adverse effects of a variety of environmental exposures, including air pollution,[14][15][16][17] noise,[18] manganese,[19][20] and pesticides.
[21][22] In 2016, Dr. Sheppard was chosen to chair a panel of the United States Environmental Protection Agency to examine in what quantities nitrogen oxides are harmful.
[25] In 2021, Dr. Sheppard was appointed chair of the United States Environmental Protection Agency Clean Air Scientific Advisory Committee (CASAC).