High redshift ULIRGs and the formation of massive galaxies.

Studying ultraluminous galaxies (ULIRGs) at early times (z>2) provides
insight into the formative phases of massive galaxies around us
today. While the filed has become a relatively mature science, there
remain various aspects of this field that are still mired in
uncertainty, and new facilities offer possibilities for great leaps
forward in our understanding. I will provide an overview of this
exciting field, and present new avenues of research into high-z ULIRGs
which are significantly pushing our understanding of the
population. These include Herschel-HerMES, the South Pole Telescope
(SPT), our recently completed IRAM-PdBI survey of CO 50 high-z SMGs
(Bothwell et al. 2011), and the CDFS-LESS survey with LABOCA and its
followup.