Is master of

Describes the relationship between an expert/master and their apprentice (particularly used in art, craftmanship, etc.). Example: Rubens masterOf Anthony Van Dick (it implies that Rubens hired Van Dick as apprentice in his studio).

Is master of

Describes the relationship between an expert/master and their apprentice (particularly used in art, craftmanship, etc.). Example: Rubens masterOf Anthony Van Dick (it implies that Rubens hired Van Dick as apprentice in his studio).