Kleinig was formally winemaker and technical manager for Bibendum Wines.
She said: "I am thrilled to be joining Marks & Spencer's award winning wine team. I have winemaking experience at both boutique and large wineries and my seven years at Bibendum has given me a good understanding of the British wine market. I am looking forward to working alongside winemakers Jo Ahearne MW, Sue Daniels as well as the rest of the team, to develop the wine range further."