Maurice was part of the 80 members of France's Upper House to oppose the pro-Nazi Vichy regime openly, voting against giving full powers to Maréchal Philippe Pétain.

[3][2] Baron Edmond de Rothschild's first marriage was with the Bulgarian artist Veselinka Vladova Gueorguieva in 1958.

In 1953, he founded his first company, La Compagnie Financière Edmond de Rothschild, which became his main investment arm.

[2][1] In 1965, he launched Banque Privée Edmond de Rothschild, and developed branches in Lugano (1968), Luxembourg (1969), Fribourg (1989) and Lausanne (1992).

[6] In 1961, after visiting a Club Med vacation center in Israel, the Baron decided to settle the business debt of the company, back then on the brink of bankruptcy, and invest in its development.

He owned 34% of Club Med (around 10 million francs worth of shares) which was listed in the Paris stock exchange in 1966.

[7] He acquired a major stake in the Bank of California in 1973, for $22 million, establishing it as a holding company for his investments in the United States.

[10] After the Six-Day War, the Baron contributed to the creation of the Israel Corporation Investment fund when, in 1968, he was invited alongside other wealthy individuals by Israeli Finance Minister Pinchas Sapir to the so-called Millionaire's Conference.

This investment lasted until 2018, after the cousin companies settled a legal dispute over the use of the Rothschild family name.

[10][2] At the tail end of the 1960s, Baron Edmond de Rothschild revitalized the family tradition for yacht racing, shifting the focus from motorboats to monohull sailboats.

[2] Days before his death, the Baron published Le Culte du Vin in which he recollected his knowledge and experiences in wine production and tasting.

[20] Two special accolades were posthumously named in his honor in 1998: the "Baron Edmond de Rothschild Prize for Young Sommeliers" awarded by the Parisian Sommeliers Association,[19] and the "Edmond de Rothschild Prize" for best wine book of the year.

[25] His gifts of the 18th-century French decorative arts pieces to the Israel Museum in Jerusalem now constitute the Rothschild Room at that institution.

He became its president in 1969, offering OPEJ the Château de Maubuisson north of Paris (Val d'Oise).