The Atacama Large Millimeter/submillimeter Array (ALMA) is an aperture synthesis interferometer that currently operates from wavelengths of 3 mm to 350 microns with up to sixty-six (66) array elements, fifty-four (54) of 12-m diameter and twelve (12) of 7-m diameter. The array is located at the ALMA Array Operations Site (AOS) on the Chajnator plateau (at an altitude of about 5000 meters) in the Atacama desert in northern Chile.
While the antennas and most of the hardware for the receivers are on site, array capabilities are still expanding and the observatory is ramping up towards full operations. Early science observations have been ongoing since October 2011 and today ALMA is in its fourth Cycle of Early Science observations. Many exciting, fundamental results have already been obtained from the solar system to the early universe.
I will review the current status of the project, the array performance and efficiency, recent testing results, on-going development projects as well as sketching future developments that will enable ALMA to extend the frontiers of science even further. In short, I will present ALMA: Past, Present and Future.