My main research interests lie at the intersection of the fields of astrophysics, particle physics, and nuclear physics, concerning mostly neutrinos and the weak interactions. In the past several years, there has been strong growth at this intersection, in part due to new results from the ongoing experiments. With several new and powerful detectors being constructed, much more progress is expected. Much of my work has been focused on providing theoretical input to what can be measured in neutrino experiments and the implications of the results, for both physics and astrophysics.