Norman has worked extensively on two aspects of neutrino physics, the solar neutrino problem, and searches for neutrinoless double beta decay. In the late 1980s and early 1990s, he led a group at Lawrence Berkeley National Laboratory in its participation in the Sudbury Neutrino Observatory. His group designed and built the large geodesic structure that supported the nearly 10,000 photomultiplier tubes that were used to observe Cherenkov light from neutrino interactions in the D 2 O (heavy water) target. He, along with co-workers also designed and built several devices that were used to accurately determine the energy calibration of the detector and also its neutron detection efficiency. SNO ultimately solved the solar neutrino problem by demonstrating that two thirds of the electron-type neutrinos produced through fusion reactions in the Sun oscillate into mu- and/or tau- neutrinos before reaching the Earth. This measurement led to the awarding of the 2015 Nobel Prize in physics and the 2015 Breakthrough Prize in Fundamental Physics.