High Redshift Obscured Quasars and the Need for Optical to NIR, Massively Multiplexed, Spectroscopic Facilities

We emphasize the need for future massively multiplexed spectroscopic instruments that can perform dedicated surveys in the optical and NIR to pin down the nature and demographics of obscured growing black-holes at z > 1. These key studies will shed light on the role of black holes in galaxy evolution during the epoch of peak growth activity.