In 1909 the family moved to Paris after Dangeard's father was offered and accepted a position at the prestigious Académie des Sciences.

Three years later, in March 1947, Dangeard married again, this time to Anne Marie Coville (1908–1998) with whom he had a son, Bernard.

He is thought to have worked closely with his brother, geologist and oceanographer Louis Dangeard, who also took part in marine expeditions.

Dangeard was member of such scientific societies as: In 2002, botanist Thomas Friedl and Charles J. O'Kelly, circumscribed Dangemannia, which is a genus of green algae in the family Oltmannsiellopsidaceae.

[7] In succession to his father, who died in 1947, Pierre Dangeard was editor of the botanic journal Le Botanist.

The elder Dangeard foresaw the name problem and confronted it on the occasion of his publishing his son's thesis in the journal Le Botaniste: