  The Nambu--Jona-Lasinio model is the simplest field theory of a composite
scalar boson, consisting of a pair of chiral fermions. A bound state emerges
from an assumed point-like 4-fermion interaction and is described by local
effective field, $\Phi(x)$. We review this in the context of the
renormalization group and show some its phenomenological successes, such as the
QCD chiral dynamics and the prediction of stable heavy-light resonances that
reveal the single light quark chiral dynamics. We also review some
NJL--inspired composite Higgs models. We then describe a novel UV completion of
the NJL model, to an extended interaction, where the solution is described by a
bilocal effective, Yukawa field, $\Phi(x,y)$. I conclude with a personal
recollection of Yoichiro Nambu.
