computer scientist
A person who studies or works in computer science. The term is straightforward and neutral.
He conducts research as a computer scientist at the university.
The computer scientist developed a new algorithm.
情報科学者 is a broader term for 'information scientist', which may include library science or informatics, while 計算機科学者 specifically refers to computer science.
Compound of 計算機 (computer) + 科学 (science) + 者 (person). The term is a direct translation of the English 'computer scientist'.