Takaaki Kajita and Arthur McDonald have been jointly awarded the 2015 Nobel Prize in Physics 'for the discovery of neutrino oscillations, which shows that neutrinos have mass'. Takaaki Kajita is a Japanese physicist who is well known for neutrino experiments at the Kamiokande and the even more outsized Super-Kamiokande.This volume of collected works of Kajita on neutrino oscillations provides a good glimpse into the rise of Asian research in the frontiers of neutrino physics. Japan is now a major force in the study of the three families of neutrinos. Much remains to be done to clarify the...