After gaining experience in various banking departments, Lionel worked as a trader in a private bank and later as a wealth manager at Credit Suisse Geneva, focusing on the Japanese market. He then joined Bank Sarasin In Switzerland as Head of the Japanese Market, followed by Lombard Odier in Geneva, and later Lombard Odier in Tokyo, where he served as Head of International Clients. Subsequently, Lionel founded his own company, LBY Consulting Sàrl in Switzerland, where he provides global wealth solutions services to international clients, with a primary focus on Japanese clients.