Bassler is currently deputy director at France’s National Institute for Nuclear and Particle Physics (IN2P3 - CNRS). After her PhD at the Pierre and Marie Curie University in Paris, which she completed in 1993, she went on to work at the LPHNE Laboratory of Nuclear and High-energy Physics in Paris, where she studied the structure of the proton as a member of the H1 experiment at HERA, the unique electron-proton collider at DESY in Hamburg, Germany. In 1998, she joined the DØ experiment at the Tevatron collider at Fermilab, where she worked on the DØ calorimeter designed to measure particle energies with high precision and contributed to improving our understanding of the properties of the top quark particle. Between 2007 and 2013 she headed the particle physics division at the Institute of Research into the fundamental laws of the Universe at French Alternative Energies and Atomic Energy Commission (CEA), in Saclay, France. Within the IN2P3 directorate, she was involved, in particular, in preparing the Institute’s contribution to the detector upgrades for the High-Luminosity LHC and in shaping France’s involvement in the European Open Science Cloud.
Bassler has participated in several national and international committees, such as the CVI, the international committee that evaluated the activities of INFN in Italy, as well as the Scientific Council of DESY in Germany, and HEPAP at the DOE in the United States. She also took part in the evaluation of the starting grants of the European Research Council and was a member of the LHC Committee at CERN and the LBNC Committee at Fermilab. She has been a delegate of the CERN Council since 2015.