How to find who cited a researcher the most
Yes. Google scholar is your best tool and friend. It will tell you how many times a paper was cited and by which papers. 

Here is the help site, it is directed towards your own papers but once you check any paper you can see the cites. https://www.google.com/intl/en/scholar/citations.html#citations 

You can search for any paper or topic and under each result, besides the star symbol and " it says 'cited by/citado por' and a number, that tells you how many people cited the material in other materials, and if you click on it you will get a list of all the other materials that cited it. The name of the researchers are under the titles. You can do a discrimination analysis based on the papers with more cites. Which you can get the numbers for in the statistics section top left.

Other option, is the 'related articles/articulos relacionados'right to the 'cited by', that one open a page with all articles that are related by citation. 

Besides that, you can go top left on the 3 lines symbol to open the list and go to 'statistics' for the  whole list of publications related and how many times it was used/cited by who. You can sort it too by field.