On February 3, 1969, New York lawyer and businessman was appointed the Beatles' business manager, as John was impressed by what the man had done financially for the Rolling Stones.

Allen B. Klein

Explanation:

Allen B. Klein was an American businessman that became a powerful person in the music industry because he managed several artists and became well known for helping them increase their income and he worked with Sam Cooked, the Rolling Stones and The Beatles who hired in him in 1969 as their manager. According to this, the answer is that on February 3, 1969, New York lawyer and businessman Allen B. Klein was appointed the Beatles' business manager, as John was impressed by what the man had done financially for the Rolling Stones.

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