Neutron beta decay spectrum, lifetime, and angular correlation measurements provide input to important tests of the standard model.  There are more than 20 observables that can be measured in neutron beta decay, including the lifetime of the free neutron, the Fierz interference term, and a variety of angular correlations.  Many of these  observables are either poorly known or the matter of some controversy, including the lifetime, for which recent measurements differ by almost 4 standard deviations.  Current experiments to measure these observables, including the UCNTau, UCNA/B, and Nab experiments being worked on at LANSCE, will improve global measurements of these values and may reveal BSM physics.