This is the 8441st most frequent Japanese word.
慎一郎
"慎一郎" (Shin’ichirō) is a Japanese male given name, typically meaning "cautious" (慎), "one" (一), and "son/man" (郎).
In this sentence, "慎一郎" is used as a proper noun, referring to an individual's name.
慎一郎は大学で心理学を専攻しています。
Shinichirō is majoring in psychology at university.
Here, "慎一郎" identifies the person who authored a specific report, again serving as a proper noun.
昨日、慎一郎が書いたレポートを読んでみたけど、良く書けていたよ。
Yesterday, I read the report written by Shinichirō, and it was well-written.
In this context, "慎一郎" signifies the owner of the art collection being described, functioning as a possessive reference to an individual.