verb agreement - Number when using "one of those who..."

Which of the following sentences is grammatically correct?

1. He is one of those who prefer studying over traveling.




2. He is one of those who prefers studying over traveling.

Should the verb after the "one of..." clause agree with the subject in number? Or should it just be plural?

Answer

prefer refers to those guys, and should be in the plural - Those guys prefer.

Those guys prefer studying to travelling. He is one of them. He is one of those guys who prefer studying to travelling.