Observation of lepton flavor violation (LFV) in the current round of experiments would provide an unambiguous sign of New Physics. All models of LFV New Physics can be encoded in a low energy effective Lagrangian that contains over a dozen distinct operator structures. I will discuss how to constrain Wilson coefficients of those operators from the data obtained in various LFV leptonic and radiative leptonic transitions of B/D/K mesons, LFV decays of various quarkonia, as well as directly from the LHC data.