“the leader of our research team has studied this issue for 10 years. she earned a phd from harvard university and has, since then, been a world leader in her field” this statement reflects power.

This statement reflects expert power.
The statement is telling us about the person who has a PhD and a lot of experience in her field. This means that she is an expert when it comes to that particular study field and is the right person to be the leader of this research team.

I would not like to live in a big city because I am not a fan of large crowds. I believe a small town leads to less crime and a stronger bond throughout the community.