In 1956, he joined Lazard Freres, and, in 1961, became a partner Under the stewardship of the chairman of André Meyer, Felix Rohatyn, who handled acquisitions, and he himself, who was the bookkeeper, Lazard grew rapidly. In 1975, his father died and he inherited his equity stake in Lazard, becoming the largest stakeholder in both Lazard New York and Lazard Paris, while also holding stakes in Lazard London. In 1977, when Meyer became sick and Rohatyn turned down an offer to replace him, David-Weill was named chairman. He continued to work closely with managing director, Felix Rohatyn, who was also made senior partner at Lazard in 1961. Also, by the power provided in clause 4.1 of the Lazard partnership agreement, he alone had the power to set compensations and the right to fire any partners at his discretion. Under David-Weill's direction, Lazard began to expand its business from traditional merger-and-acquisition advising to areas such as asset management and municipal bond. He also made numerous hires, including Steven Rattner. Lazard's profits also jumped from $5 million in the late 1970s to $500 million in the late 1990s. David-Weill also reunited the branches of Lazard by combining his stakes in New York and Paris and a buyout of Pearson for its stake in Lazard London for more than $600 million. After the retirement of Rohatyn, the firm's most prominent dealmaker, Lazard under David-Weill's leadership began to take a turn for the worse. Other dealmakers such as J. Ira Harris and Rattner also left the firm. To strengthen Lazard, David-Weill hired Bruce Wasserstein as the CEO, who later decided to take Lazard public against the wishes of the family patriarch. David-Weill later stated that he regretted ever having hired Wasserstein. David-Weill is currently a director of Groupe Danone, one of the world's largest food-product companies.
Personal life
In 1956, he married Hélène Marie Lehideux, daughter of Robert Lehideux, the brand president at Renault. They have three children: Béatrice, married to Édouard Stern; Cécile, married to Emmanuel Renom de La Baume; and Nathalie, married to Olivier Merveilleux du Vignaux. He was honored by the government of France, made a Commander of the Legion of Honor and a Commander of Ordre des Arts et des Lettres, the nation's highest cultural honor.