A Master of Wine is an industry professional who has exceptional expertise in the wine business. To become a member of the Institute of Master of Wine each candidate must pass a rigorous exam as well as adhere to a code of conduct. The exam, which was first written in 1953, tests the candidate’s knowledge of wine theory, their tasting ability and requires the completion of an original research paper. A Master of Wine is also known as an MW.
More information about Masters of Wine can be found here https://www.mastersofwine.org/