When you click on a record in JETFind, you may notice a Related Persons panel included.
Related persons includes information about authors and other creators as well as information about people whom the source is about. In the example above, information about Stanley Sadie and Wolfgang Amadeus Mozart are included. Stanley Sadie is the book's author, and the book is about Wolfgang Amadeus Mozart. The information comes from Library of Congress and Wikidata. You can click on either name for more information.
When you click on the name, in addition to more information about the person, you will also see titles in the library by the person, titles in the library about the person, and people associated with the person (such as co-authors), all of which can be clicked on for more information.