H.E. Lorentz, a Nobel Prize-winning physicist, was an older contemporary of Einstein's who inspired and guided Einstein in his work. Lorentz, however, never fully subscribed to special or general relativity and believed to his death that what is now called "Lorentz Ether Theory" was the better interpretation of special relativity. I'm researching modern efforts to generalize LET as an alternative to general relativity. I've thus far reviewed attempts by Herbert Ives, John Bell, Quentin Smith, Antony Valentini, Franco Selleri, and Reginald Cahill to create some type of generalized LET. Bell and many others have focused on Alain Aspect's experiments confirming non-locality as the basis for a revision of SR and GR. With instantaneous action at a distance, confirmed experimentally by Aspect and many others many times over, the basis for SR is significantly (or perhaps completely) undermined, because Einstein's clock synchronization convention was based on the inability to establish any kind of absolute simultaneity. But with non-locality, determining absolute simultaneity, as Karl Popper and others have pointed out, becomes possible. Does anyone know of other attempts to generalize LET? Any thoughts on how to assess which efforts are the most credible?