Gossett joined the Cornell faculty in 1976. He was a faculty research fellow (1980) and a visiting professor (1984-85) with the U.S. Air Force Research Laboratory, and maintains close ties with that facility, in terms of both research and consulting. He was a NATO fellow (1987-92), participating in a pilot study on remedial-action technologies for contaminated land and groundwater; and a Pacific Northwest National Laboratory (PNNL) Affiliate Staff Scientist (1996-1999). Gossett is a member of the Association of Environmental Engineering & Science Professors, and the American Society for Microbiology.