High-Redshift Galaxy clusters: Cosmology and Galaxy Evolution

High redshift galaxy clusters provide powerful constraints to cosmological models and scenarios of galaxy formation and evolution. I will describe a large 100sq deg optical imaging survey using the new generation of wide-field mosaic CCDs at CFHT and CTIO to generate a complete sample of rich galaxy clusters at redshift between 0.4 and 1.4. This survey will produce by far the largest high-redshift cluster sample. Some preliminary results and their implications will be presented. Also, future plans for detailed studies of amny aspcts of cluster properties, dynamics, and evolution will be discussed.