Prof. William Holzapfel, Physics Dept., UC Berkeley talks about the Arcminute Cosmology Bolometer Array Receiver (ACBAR). Primary anisotropies of the Cosmic Microwave Background (CMB) encode a wealth of information about the early Universe. Recent degree-scale experiments have begun to exploit the potential of the CMB as a precision probe of cosmology with encouraging results. High-resolution images of the CMB can be used to provide improved constraints on cosmological parameters and study the growth of structure in the Universe. ACBAR is a powerful new instrument designed to image the CMB with resolution of 5 arcminutes. ACBAR was deployed to the South Pole in December 2000, and has recently produced the most sensitive images of the CMB of any experiment to date. He discusses the construction and operation of the receiver, and presents the key results from the first two years of observations.