Marie Besnier Beauvalot was born in 1980. Her Father, Michel Besnier, served as the CEO of Lactalis from 1955 to 2000. Her paternal grandfather, André Besnier, founded the Besnier Group (later known as Lactalis) in 1933. She has two brothers: Emmanuel Besnier, who serves as the CEO of Lactalis, and Jean-Michel Besnier.
Besnier inherited 100% of Lactalis with her brothers in 2000. As of 2018, she is worth an estimated US$5.6 billion.