Google:
Search artist by name. Also try searching by image. VERIFY THE RESULTS!! Web searches can lead you to recent gallery shows, and provide an inroad to exhibition catalogs or works that are not available anywhere else.
Museum/Gallery web sites:
Occasionally galleries may have catalogs for past exhibitions that have not made it into libraries. Knowing the name/location of a gallery and the approximate date of an exhibition gives another way to search for reviews and/or interviews; artist’s statements, etc.