Joseph M. Acaba

Joseph Michael Acabá (born May 17, 1967) is an American educator, hydrogeologist, and NASA astronaut. In May 2004, he became the first person of Puerto Rican ancestry to be named as a NASA astronaut candidate, when he was selected as a member of NASA Astronaut Training Group 19. He completed his training on February 10, 2006, and was assigned to STS-119, which flew from March 15 to 28, 2009, to deliver the final set of solar arrays to the International Space Station. He is the first person of Caribbean and Puerto Rican origin, and the twelfth of fifteen people of Ibero-American heritage to have flown to space as a NASA astronaut.

Acabá served as a flight engineer aboard the International Space Station, having launched on May 15, 2012. He arrived at the space station on May 17 and returned to Earth on September 17, 2012. Acaba returned to the International Space Station in 2017 as a member of Expedition 53/54. From 2023 to 2025, Acaba served as the 18th Chief of the Astronaut Office.