After having fitted the Cossacks with shoes, he put his talent and manufacturing secrets to work for livestock merchants and other horse traders at the Marché de La ViIlette. The bottine Villette, fruit of his skill and experience, made his reputation. In 1938 he passed on his know-how to his son Marcel Liebermann, who also became a first-rate shoemaker. Following the dark years of the last war (resistance, Vercors, liberation of Nice), Marcel returned to his shop in Paris in 1945 at La Villette, subsequently setting up shop at Les Halles de Paris at the start of the 1960s. At this time, Jean-Claude Liebermann had just received his basic maths baccalaureate and intended to become a doctor, when suddenly, he abandoned his studies His father took the situation in hand and made him a no-nonsense proposition: "either you learn a trade or you leave this house!". He then studied to become a hairdresser, a job for which he turned out to have some talent (diplomas and 3rd Meilleur Ouvrier de France). In 1967, he worked on board the ocean liner "France" as a hairdresser in 1st class. For five years, he dressed all the heads of the international "Gotha", from Liz Taylor to David Niven, from Jean Gabin to Gina Lollobridgida, even including Salvador Dali's moustache.

During the 1980s, he succeeded his father (Officier du Mérite National), created his own company, built his current shop and received a Mercure d’Or for the quality of his produce and his skills. Au savetier de Rungis 2000 is a bastion of quality and top-of-range footwear and clothing with famous brand names. The 60 m2 shop floor displays over 4,800 references. On entering to buy a pair of shoes, the customer is treated to a discourse on the making of leather shoes and other moccasins (supported by models cut in cross-section to help understand the production process). A highly popular and welcoming modus operandi, as Jean-Claude Liebermann "does not have customers, only friends!". "I started to broaden my range twenty years ago, by creating a "protective clothing" department. My clientele consists of companies (30%), agents (20%) and retailers from all sectors (50%) who sometimes perform dangerous occupations. In addition I offer customised clothing, major brand names, and also large sizes. My clientele comes to me for the quality and originality of the models. I supply top-class hotels, restaurants and caterers, ministries, the Senate and even the President of the Republic.