[2][5] De Beaumont started his business career as an assistant manager on rubber plantations in Indo-China.

After returning to France he became president of several companies operating in the Far East and South Africa.

Because of his business connections with Africa he was the first IOC Member to actively promote Olympic sports there.

In France, de Beaumont served as a Member of Parliament in 1936–40, and fought as a pilot during World War II.

[2] On 10 July 1940, he voted in favour of granting the cabinet presided by Marshal Philippe Pétain authority to draw up a new constitution, thereby effectively ending the French Third Republic and establishing Vichy France.