2 of 2 Formatted text and questions and title, and added tag for relative clause.

Using “is” versus “are” in a relative clause

I have run into a small question that I would like to check. When referring to one person out of a group, would one use "is" or "are"?

For example:

  1. I know you are one of the members that is running things.

  2. I know you are one of the members that are running things.

For singular "one" it should be "is", but for plural "members" it should be "are". I'm hitting a mental block here and I'm uncertain, so any clarification would be greatly appreciated.