Enlarge / Margaret H. Hamilton received the Presidential Medal of Freedom from Barack Obama on Tuesday, November 22. (credit: White House)

On Tuesday, President Barack Obama awarded the Presidential Medal of Freedom to several luminaries in the arts, sports, and sciences.

Of those, the class of 2016 included two women who played crucial roles in American computer science in the 20th century: Margaret H. Hamilton and Rear Admiral Grace Hopper, who was given the award posthumously.

Here’s how the White House described the pair: