Domaine Clarence Dillon is administered by the principal descendants of the Dillon family. Seven members of the Board of Directors of Domaine Clarence-Dillon are members of or are related to the Dillon family.

Prince Robert of Luxembourg has served as an administrator at Haut-Brion since the age of 18. He became Président Directeur Général of Domaine Clarence Dillon SAS in 2008

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Joan, Duchesse de Mouchy succeeded her cousin, Seymour Weller to the presidency of Domaine Clarence Dillon S.A. in 1974. She is currently Président d'honneur.

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Philippe, Duc de Mouchy is the husband of Joan Dillon. After their marriage he began working for the company. He became a Managing Director of Domaine Clarence Dillon until his retirement at the end of 2003.

Olivier Bizot formerly served as an officer in the Foreign Legion. Upon returning home he built up and ran his own company in the building trade. He is an old family friend who has been a director since 1994.

Mark Collins is the nephew of Joan, duchesse de Mouchy, and like his grandfather, maintains an active interest in politics. He has worked in the international section of the U.S. Department of Treasury, and as U.S. director of the World Bank. Now in private practice working in investment banking, he travels to Haut-Brion at least twice each year.

Alexandra Allen, the elegant granddaughter of Dorothy-Dillon Eweson, works at Sotheby's in New York. She is a longtime visitor to Paris, and holds a Master's degree in French studies from the Sorbonne. Like her cousins, she enjoys visits to Haut-Brion and returns as often as possible. She has active interests in horseback riding and tennis.

Charlotte Cunningham, born Princess Charlotte of Luxembourg, daughter of the Duchesse de Mouchy, is now on the Board of Domaine Clarence Dillon. She lives in London and runs an Art Centre, a theater and venue for cultural events. The Centre also provides courses for disabled children, giving them the opportunity to develop their specific talents.

Philip Allen lives in Far Hills, New Jersey. He is the son of Dorothy Dillon-Eweson and father of Alexandra Allen.

Christine Allen has two main interests. One is Public Health concerns, both in the environment and concerning infectious diseases, especially in Africa. She actively participates in Harvard School of Public Health initiatives, both by financial support for some scholarships, and by Committee work and traveling to visit projects in many countries. Her other interest is in travel, and in history, especially history and travel together, as in the area covered by the Greek, Roman, and Byzantine Empires. She also enjoys revisiting the archeological dig where she worked for four summers in the Southern Galilee, and hopes to visit other archeological sites in the Middle East.

Martin Zetterberg splits his time between New York, NY and Princeton, NJ. He is an active fiduciary and Co-Chairman of Keswick Management Inc., a family office in the financial services sector.