For this assignment, the fastest way to find an expert in your topic is to search for a university professor.
Professors often have done extensive research in their subject area and could be considered experts on a given topic.
Look at departmental pages of university websites.
Identify what subject or discipline your topic falls under.
Go to departmental pages for that subject discipline.
For UNI, go to uni.edu and search in the general search box. Example: "history department"
Once you are on the departmental page, look for a staff listing. Look at the courses professors teach and/or research interests.
Google search using site:edu
Using the search trick of site:edu limits to only university websites
Example: "Your topic" faculty site:edu
Example: phobia faculty site:edu