I. Joseph Kroll is the Fay R. and Eugene L. Langberg Professor of Physics and Astronomy in the School of Arts & Sciences. He formerly held the Robert I. Williams Endowed Term Chair. Kroll’s research is in accelerator-based experimental particle physics, and he has worked on the study of proton-proton collisions, proton-antiproton collisions, and electron-positron collisions.

Kroll is currently a member of the ATLAS experiment at the CERN Large Hadron Collider in Geneva. There, his group has played a leading role in the search and discovery of the Higgs boson and in searches for as-yet-undiscovered particles that may explain unanswered questions in the current standard model of particle physics.

Kroll is a fellow of the American Physical Society and a fellow of the American Association for the Advancement of Science. He is co-recipient of the following prestigious awards: the 2013 European Physical Society (EPS) High Energy and Particle Physics Prize for the discovery of the Higgs boson, the 2019 EPS High Energy and Particle Physics Prize for the discovery of the top quark, and the 2025 Breakthrough Prize in Fundamental Physics for advances in high-energy collisions at the Large Hadron Collider.