The 13th Atmospheric Chemistry Colloquium for Emerging Senior Scientists, ACCESS XIII, will be convened at Brookhaven National Laboratory on Long Island, New York, on July 30 to August 2, 2015. ACCESS is held in conjunction with the Gordon Research Conference (GRC) in Atmospheric Chemistry. The purpose of ACCESS is to bring together young researchers in atmospheric chemistry and representatives of the principal federal agencies that fund atmospheric chemistry research to engage in scientific discussion and interaction.