Galaxy clusters provide valuable constraints on the structure of both the dark matter and baryonic components of universe, and on cosmological parameters.  Clusters at z > 1 provide particularly strong constraints on the cosmic evolution of both galaxies and large scale structure; however, only a handful of clusters have been discovered at z > 1, due to the technical challenges of detecting such distant and faint systems.  The RCS surveys are wide-field optical surveys for clusters to z=1, based on over-densities of galaxies along the well-defined red sequence of galaxy colors. I will review the RCS cluster finding techniques and our first survey results, including cluster X-ray properties and the evolution of cluster galaxies.