NASA assigned veteran Andrew Feustel and Epps to missions aboard the ISS in 2018.
Feustel will launch in March 2018 for his first long-duration mission, serving as a flight engineer on Expedition 55 and later as commander of Expedition 56.
Epps will join Feustel as a flight engineer on Expedition 56 and remain on board for Expedition 57.
"Each space station crew brings something different to the table, and Drew and Jeanette both have a lot to offer. The space station will benefit from having them on board," said Chris Cassidy, chief of the Astronaut Office at NASA's Johnson Space Centre in Houston.
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She went on to complete a master's of science in 1994 and a doctorate in 2000 in aerospace engineering from the University of Maryland.
While earning her doctorate, Epps was a NASA Graduate Student Researchers Project fellow, authoring several journal and conference articles on her research.
After completing graduate school, she went on to work in a research laboratory for more than two years, co-authoring several patents, before being recruited by the US Central Intelligence Agency.
She spent seven years as a CIA technical intelligence officer before being selected as a member of the 2009 astronaut class.
Feustel was selected as part of the 2000 astronaut class and, in 2009, flew on the space shuttle Atlantis for the final servicing mission of NASA's Hubble Space Telescope.
He made his first trip to the space station in 2011 as a member of the STS-134 crew on space shuttle Endeavour's final mission.
With the help of the more than 200 astronauts who have visited, the space station enables us to demonstrate new technologies and make research breakthroughs not possible on Earth.