In 1954, he joined White Weld & Co., one of the oldest and leading American investment banking firms, acquired by Merrill Lynch in 1977.
[2] He is regarded as one of the main architects and developers of the Eurocapital market (Eurobond) in which the firm he led played a dominant role.
This was again demonstrated in 2016 when an international syndicate of banks floated a $42 billion issue of bonds for Anheuser-Bush InBev.
During the last twenty years, Genillard has also been quite active in industry, notably with ties to the Thyssen-Bornemisza Group, an industrial employing some 20,000 people worldwide at the time, having led the parent company, TBG Holdings N.V. as its chief executive from 1977 to 1983, and having served as deputy chairman of its supervisory board between 1971 and 1994.
He has served as a director or advisor on the boards of various companies of international significance, among which Alusuisse (vice-chairman), American Express[citation needed] Company, Cabot Corporation International Board, Clariden Bank (later Clariden Leu) (founder-chairman – honorary chairman), Compagnie des Machines Bull, Credit Suisse Group (vice-chairman), Credit Suisse[2] (vice-chairman), Credit Suisse First Boston (vice-chairman), Corning Inc. (now director emeritus), Honeywell International, Novartis, and Société des bains de mer de Monaco (SBM).