Continuously improving measurements of the cosmic microwave background (CMB) combined with rapidly developing data analysis techniques have led to the establishment of the standard model for modern cosmology. The best cosmological constraints from the CMB today come from the Planck satellite. The current expansion rate of the universe (Hubble constant) inferred from the Planck CMB measurements differs from that determined from receding supernovae in the local universe. Combining the CMB data from the Atacama Cosmology Telescope (ACT) and the WMAP satellite, we recently made an independent measurement of the Hubble constant. I will describe the ACT instrument and data analysis, and highlight our recent cosmological results.