A Hubble Space Telescope Survey of X-ray Luminous Galaxy Clusters:   Gravitationally Lensed Arcs and EROs
  We are conducting a systematic lensing survey of X-ray luminous galaxy clusters at z~0.2 using the Hubble Space Telescope and large ground-based telescopes. We summarize initial results from our survey, including a measurement of the inner slope of the mass profile of A383, and a search for gravitationally lensed Extremely Red Objects. 
Graham P. Smith