The past twenty years have been a period of tremendous progress in cosmology: we now have a simple cosmological model that fits a host of observations. Still, many open questions remain, some of which we may be on the verge of answering in the near future. Among these are the mass of neutrinos, the nature of dark energy, and the nature of the inflationary paradigm. In the community-wide effort to answer these questions, this year promises to be extraordinary: several experiments have or will release results of lasting legacy, and these experiments should start to reach the required accuracy to answer some of these open questions. The purpose of the Aspen conference will be to assess the current state of cosmological constraints, to identify open issues in the interpretation of these data, and to draw lessons for the next generation of experiments.

The registration deadline for full consideration is 30 Nov 2014 .