Database of top researchers by keyword
Go to Google Scholar.

Search for label:discipline (such as &quot;label:nutrigenomics&quot;).
If the discipline contains more than one word, then use an
underscore to separate the words (e.g.
&quot;label:international_relations&quot;).

Click on &quot;Profiles&quot; in the menu.

The result should be a list of scholars (who have set up Google
Scholar profiles) within the selected discipline, sorted by citations. Like here.