She is the project leader for ROSINA, two mass spectrometers aboard Rosetta determining the makeup of the 67P comet. Altwegg has over 25 years of experience in developing mass spectrometers for comet missions, in data analysis of mass spectrometers and in cometary science. She has proven performance in the scientific, engineering, and program management aspects of delivering these instruments on schedule, at cost, without having to incorporate any descopes or changes in planned performance.