Science with Gravitational Lensing

Gravitational lensing GL is becoming a standard tool in Astronomy Different regimes of GL for example weak lensing strong lensing or micro lensing answer to different astrophysical problems ranging from probing the underlying cosmology to the detection of extrasolar planets In this talk I will review some of the more prominent science with GL its history present and future efforts as well as key results mainly with respect to insights on dark matter and on the first galaxies in the universe I will highlight our contribution to these field