Pierre Fatou's parents were Prosper Ernest Fatou (1832-1891) and Louise Eulalie Courbet (1844-1911), both of which were in the military.
Pierre's family would have liked for him to enter the military as well, but his health was not sufficiently good for him to pursue this type of career.

Fatou entered the École Normale Supérieure in Paris in 1898 to study mathematics and graduated in 1901 when he was appointed an intern (stagiaire) in the Paris Observatory.
Fatou was promoted to assistant astronomer in 1904 and to astronomer (astronome titulaire) in 1928.
He worked in this observatory until his death.

Fatou was awarded the Becquerel prize in 1918; he was a knight of the Legion of Honour (1923).
He was the president of the French mathematical society in 1927.

He was in friendly relations with several contemporary French mathematicians, especially, Maurice René Fréchet and Paul Montel.

In the summer of 1929 Fatou went on holiday to Pornichet, a seaside town to the west of Nantes.
He was staying in Le Brise-Lames Villa near the port and it was there at 8 p.m. on Friday 9 August that he died in his room.
No cause of death was given on the death certificate but Audin argues that he died as a result of a stomach ulcer that burst.
Fatou's nephew Robert Fatou wrote:
Having never thought it useful during his life to consult a doctor, my dear uncle died suddenly in a hotel room in Pornichet.

— Pierre Joseph Louis Fatou, http://www-history.mcs.st-andrews.ac.uk/Biographies/Fatou.html
Fatou's funeral was held on 14 August in the church of Saint-Louis, and he was buried in the Carnel Cemetery in Lorient.
Pierre Fatou's parents were Prosper Ernest Fatou (1832-1891) and Louise Eulalie Courbet (1844-1911), both of which were in the military. Pierre's family would have liked for him to enter the military as well, but his health was not sufficiently good for him to pursue this type of career.
Fatou entered the École Normale Supérieure in Paris in 1898 to study mathematics and graduated in 1901 when he was appointed an intern (stagiaire) in the Paris Observatory. Fatou was promoted to assistant astronomer in 1904 and to astronomer (astronome titulaire) in 1928. He worked in this observatory until his death.
Fatou was awarded the Becquerel prize in 1918; he was a knight of the Legion of Honour (1923). He was the president of the French mathematical society in 1927.
He was in friendly relations with several contemporary French mathematicians, especially, Maurice René Fréchet and Paul Montel.
In the summer of 1929 Fatou went on holiday to Pornichet, a seaside town to the west of Nantes. He was staying in Le Brise-Lames Villa near the port and it was there at 8 p.m. on Friday 9 August that he died in his room. No cause of death was given on the death certificate but Audin argues that he died as a result of a stomach ulcer that burst. Fatou's nephew Robert Fatou wrote:
Having never thought it useful during his life to consult a doctor, my dear uncle died suddenly in a hotel room in Pornichet.
— Pierre Joseph Louis Fatou, http://www-history.mcs.st-andrews.ac.uk/Biographies/Fatou.html
Fatou's funeral was held on 14 August in the church of Saint-Louis, and he was buried in the Carnel Cemetery in Lorient.
Pierre Fatou