Prince Jean of Luxembourg (given names: Jean Félix Marie Guillaume; born 15 May 1957), the second son of Jean, Grand Duke of Luxembourg and Princess Joséphine-Charlotte of Belgium. He is the twin brother of Princess Margaretha. He frequently goes by the name of Jean Nassau. On 26 September 1986, Prince Jean renounced his right of succession to the Luxembourg throne. Education and youth Prince Jean's godparents were Prince Felix of Luxembourg and Princess Margrethe of Denmark. Prince Jean was educated in Luxembourg, Switzerland and France, where he obtained his baccalaureate. He then undertook a language course at the Bell School of Languages in Cambridge England. In 1977, Prince Jean began his military officer training at the Royal Military Academy Sandhurst, England and member of the Champion Platoon, having been commissioned in August 1978. He was made a captain of the Luxembourg Army in 1979. After completing his university education in Geneva, he went to New York and joined W.R. Grace as a financial analyst working in the Finance, Planning & Analysis Division of the Group that reported to the President & CEO of the company - at the time, Mr J. Peter Grace. Back in Europe in 1985, in 1986 he obtained an MBA from INSEAD in Fontainebleau, France. Career Prince Jean works in the water industry as an advisor to the GDF-Suez Group, Executive VP of the Suez Fondation and a member of the executive board of Degrémont, a subsidiary of Suez Environnement. Prince Jean has been President of the Chambre de Commerce belgo-luxembourgeoise en France. In 2006 he bought the Southern African Water subsidiary of Suez Environnement, WSSA (Water & Sanitation South Africa) and created Mea Aqua, with the objective of developing water and energy solutions in the Middle East and in Africa. Mea Aqua and its subsidiaries employ today over 2,500 employees. Prince Jean is a member of the board of the MIP, a business school based in Paris and a board member of a number of financial institutions: Banque Degroof Luxembourg, EFG Bank and EFG International, Ecofin (hedge funds in the utilities sector). Marriage and family On 27 May 1987, Prince Jean married morganatically in Paris, France, Hélène Suzanna Vestur (b. 31 May 1958, Saint-Germain-en-Laye, France), now a high civil servant, Conseiller d'Etat and judge, daughter of François Philippe Vestur (b. 1927), merchant, and his wife Cécile Ernestine Buisson (b. 1928). His wife and children bore