Armstrong has been director of the U.S. Census Bureau's Philadelphia Regional Office since April 1998. He is in charge of office staff and field representatives who interview respondents and complete surveys in Pennsylvania, Maryland, Delaware, most of New Jersey and Washington, D.C.

Armstrong, a native of Puerto Rico, began his Census Bureau career in 1978 by working on the Economic Census and Census of Agriculture in Puerto Rico. He became area manager in Puerto Rico for the 1980 Census.

Armstrong worked as a supervisory survey statistician in Atlanta during the early 1980s, except for a stint in Puerto Rico as area manager for the 1982 Economic Census. He became a program coordinator in the Philadelphia office in 1985. He was named an assistant regional census manager in Philadelphia in 1987, then in New York in 1989. After working again as a program coordinator in Philadelphia, Armstrong was named assistant regional director in New York in 1996.

For his outstanding efforts in employing and developing careers for minorities, he received the Census Bureau's Equal Employment Opportunity Award in 1986. In 1987, the Philadelphia Federal Executive Board awarded him the Hispanic Employment Program Achievement Award. In 1992, he was awarded the Department of Commerce's Bronze Medal Award.

Armstrong attained a bachelor's degree in political science from The Catholic University in Puerto Rico in 1978. He currently resides in Mount Laurel, N.J.