Gravitational time delays, observed in strong lens systems where the variable background
source is multiply imaged by a massive galaxy in the foreground, provide direct …

Recent rapid progress in time domain surveys makes it possible to detect various types of
explosive transients in the Universe in large numbers, some of which will be gravitationally …

We present results from a comprehensive lensing analysis in Hubble Space Telescope
(HST) data of the complete Cluster Lensing And Supernova survey with Hubble cluster …

Large surveys of galaxy clusters with the Hubble Space Telescope (HST) and Spitzer,
including the Cluster Lensing And Supernova survey with Hubble and the Frontier Fields …

We give an overview of the Grism Lens Amplified Survey from Space (GLASS), a large
Hubble Space Telescope program aimed at obtaining grism spectroscopy of the fields of 10 …

JCW had long wanted to write a new monograph on supernovae. Despite an immense
explosion in the literature and many review articles, there had not been one since that of …

Gravitational lensing by clusters of galaxies offers a powerful probe of their structure and
mass distribution. Several research groups have developed techniques independently to …

When the light from a distant object passes very near to a foreground galaxy or cluster,
gravitational lensing can cause it to appear as multiple images on the sky. If the source is …

Supernova" Refsdal," multiply imaged by cluster MACS1149. 5+ 2223, represents a rare
opportunity to make a true blind test of model predictions in extragalactic astronomy, on a …

The past decades have witnessed a lot of progress in gravitational lensing with two main
targets: stars and galaxies (with active galactic nuclei). The success is partially attributed to …