In 1950, the majority of STEM workers were native-born and White. Its overall composition shifted because of major immigration policy changes in 1965 attracting foreign-born STEM workers, the Immigration Act of 1990 expanding the cap on employment-based visas, and the U.S. economy booming due to growth of information technology. Altogether, these factors increased the number of foreign-born skilled workers that arrived to the United States. As of the 2010-2014 period, the foreign-born STEM workforce in the United States comprised 1.6 million workers and were 22 percent of the total STEM workforce. This poster presentation uses United States employment data from the 2010-2014 American Community Survey (ACS) to examine the STEM workforce by comparing the characteristics of the foreign-born workforce relative to the native workforce. It also explores in detail the foreign-born STEM workforce by occupational groups and by racial and ethnic characteristics.