He said that Ken Bowersox, a former astronaut, who had served as the deputy associate administrator for the human exploration office would take over in an acting capacity.
Gerstenmaier started out as an engineer and eventually became the associate administrator for human exploration and operations in 2004.
The widely-respected Gerstenmaier is a NASA veteran who joined the agency in 1977, rising to become one of its top managers, overseeing the space shuttle program and USA operations on the International Space Station before becoming head of HEO.More news: This is the Mi A3, Xiaomi's new pure Android smartphone
"In an effort to meet this challenge, I have decided to make leadership changes to the Human Exploration and Operations (HEO) Mission Directorate".
In response, Bridenstine told CNN in the statement, "Chairwoman Johnson is a great member of Congress for NASA". "As we work to fill these key positions within HEO, we will stay mission focused knowing that exploration will go forward". The revised moon program is known as Artemis.
The American plan to return humans to the moon, including the first woman, is beset with delays and cost overruns, according to an official audit released last month.
UM professors Fred Adams will present his research findings in theoretical cosmology and astrophysics along with UM aerospace engineering associate professor James Cutler, who is the director of the MI eXploration Lab.More news: EU signals sanctions on Turkey over Cyprus drilling - draft
"If NASA is not now capable of landing American astronauts on the Moon in five years, we need to change the organization, not the mission, "Pence said then".
The hardware that NASA needs is either delayed, way over budget or doesn't yet exist.
But the so-called "green run" test would add five months or so to the rocket's development schedule, prompting some managers to suggest sending the rocket directly to Florida for a much shorter, less thorough hot firing atop launch pad 39B.More news: AJ Pritchard says brother Curtis’s Love Island dance moves were ‘scarring’