Stacey's research focuses on galaxy evolution in the context of local environment through studies of massive galaxy clusters out to high redshift. Through multi-wavelength observations focusing on the mid-infrared to submillimeter, she characterizes star formation and AGN in cluster and field galaxies uto z~2 in order to determine how environment shapes galaxy properties and results in the quenched nature of cluster galaxies today. At Arizona, she has joined the Mid-Infrared Instrument MIRI) team and is involved in planning early observations in preparation for the launch of the James Webb Space Telescope.