We summarize results from the first year of the Lenses Structure andDynamics Survey (LSD). Using the Echelle Imager and Spectrograph atthe Keck-II Telescope, we have measured spatially resolved velocitydispersion profiles of a sample of distant (up to z=1) early-typegalaxies that are gravitational lenses. By combining lensing anddynamical analyses we can set firm limits on the dark matter densityprofile, the controversial inner slope of the dark matter halo, themass-to-light ratio of the luminous component, the total massdistribution, and on the velocity ellipsoid by breaking the massanisotropy-relation. The implications of these measurements in termson the epoch and mechanism of formation of E/S0 galaxies and of thevalue of the Hubble constant are briefly discussed.