Sir Charles-Antoine assists Idoneus by expanding its reach with both Family Offices and luxury real estate in Belgium, France, Greece and Spain. 

He started his career by running and managing two companies specializing in various sectors of the communication fields including public relations, special events covering all forms of both digital, as well as existing social media platforms at the time. He later worked many years in real estate focusing on high end heritage real estate properties. Combining these years of experience, expertise and vast knowledge, Sir Charles-Antoine formed the firm of LA MAIRIEU Real Estate specializing in International Real Estate for luxury and investment. 

Sir Charles-Antoine has built a strategically critical international network developed by himself and his family spanning several generations. Some groups he has advised and assisted over the years include Director of Financière Vendome with a special interest in promoting inward investment in Greece as well as Engineering and Global Heritage Strategy; Gold Global Currency Corp. S.A. Da Vinci Gold Coin & Token.