We address dark matter and dark energy by investigating high redshift
clusters of galaxies with our HST multi-cycle treasury program Cluster
Lensing And Supernova survey with Hubble. Obtaining mass profiles by
gravitational lensing from deep ACS and WFC3 images of 25 clusters, we
confront predictions of the Lambda Cold Dark Matter model, formation and
evolution of structure. Our parallel Supernova search extends the Hubble
diagram of type Ia SNe to z > 1.5 , testing the constancy of dark energy
with time and probing progenitor evolution. We test double degenerate and
single degenerate scenarios by measuring the SN Ia delay time distribution.
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