Title: Towards N(z) for the Sub-mm Bright Galaxy Population Colin Borys California Institute of Technology Abstract: The SCUBA and MAMBO cameras have discovered a cosmologically significant population of luminous dusty galaxies, but precisely how they fit into the global picture of galaxy formation and evolution is still unclear. Determining the redshift distribution of this population is key in making progress, but this has proved to be very challenging observationally. In this talk I will discuss why this is, and review the progress made to date. With that foundation, I will then describe several projects underway using the new SHARC-II sub-mm camera at the CSO that are related not only to determining the redshifts, but using them to better understand the properties and evolution of these systems.