  Parton physics, when formulated as light-front correlations, are difficult to
study non-perturbatively, despite the promise of light-front quantization.
Recently an alternative approach to partons have been proposed by re-visiting
original Feynman picture of a hadron moving at asymptotically large momentum.
Here I formulate the approach in the language of an effective field theory for
a large hadron momentum $P$ in lattice QCD, LaMET for short. I show that using
this new effective theory, parton properties, including light-front parton wave
functions, can be extracted from lattice observables in a systematic expansion
of $1/P$, much like that the parton distributions can be extracted from the
hard scattering data at momentum scales of a few GeV.
