Entrepreneur Isaacman has been formally approved as the next chief of the National Aeronautics and Space Administration, ending an atypical selection saga where Trump put his name forward, pulled the nomination, and then submitted his name once more.
Isaacman, an amateur jet pilot who became the first civilian to perform a extravehicular activity, is also the first agency head in many years to come straight from outside public service.
For numerous observers, the success of his time in office will be determined by one crucial test: if NASA can send astronauts to the lunar surface before the Chinese space program.
The administration has made clear a desire for the America to create a permanent lunar base, both to allow for harvesting materials and to act as a launching pad for missions to the Red Planet.
On This week, the Senate cleared the nomination with a bipartisan vote.
The President initially pulled Isaacman's nomination in May, pointing to a "deep dive of previous relationships".
At the point, the president was publicly feuding with the SpaceX CEO, one of his largest political donors, with whom the nominee has business connections.
Isaacman has stated he is now aligned with the presidential objective to mine the moon, putting him at odds with Musk, who has said that going to the Moon is a diversion from the goal of travelling to Mars.
In the ongoing cosmic competition, world powers are vying to tap into the Moon.
“This is not the time for inaction but a time for decisive steps because if we lag, if we make a mistake, we may not recover, and the consequences could shift the strategic equilibrium here on Earth,” Isaacman told the Senate committee earlier this month.
The private sector veteran sees introducing more private sector competition as essential for achieving those targets, according to a recently leaked document detailing his plan for the agency.
In his confirmation hearing, he supported the strategy, which he developed when he was first nominated, but said it was a work in progress.
His openness to rivalry could also create a conflict with Musk. Last week, he praised the granting of a lucrative deal to Blue Origin, which is one of the few rivals of Musk's SpaceX.
In the document, he recommended NASA should expand collaboration with the scientific community, positioning the agency as a "amplifier for scientific discovery".
He highlighted the planned deployment of the Roman Space Telescope as a flagship example.
"And if we be close to something extraordinary - like deploying the Roman Telescope - I will explore every option to get the program to the pad, even providing personal financing if that's what it requires to achieve the discoveries," he wrote.
According to estimates, his wealth is valued at approximately 1.2 billion dollars, primarily derived from his financial services firm and the divestment of his business that provided flight training and managed a private fleet of military jets.
The top job at NASA will be his initial foray in government service, a contrast to the immediate predecessors appointed as NASA chief.
He will take over from Sean Duffy, who has been the temporary leader since July.