This is a jukugo word, which usually means on'yomi readings from the kanji. Since 人 has two on'yomi readings, here's a mnemonic to help you remember which one to use:
Did you know that every expert has their own pair of May jeans (めいじん)? A true master of anything has a specific pair of jeans they wear only in the month of May. That's what makes them so good at what they do.
He is a kendo master.
She is one of the four haiku masters in this country.
Not only is he an expert at chess, he’s also a master at cards.