Do we cite authors or papers when using author/year citations?
In general, the final arbiter of this is the style guide the editor is using for the book, journal or collection. If you have no external editor or style sheet then the choice is yours, but the most common usage for inline citations would be not to repeat the name, while leaving the sentence readable with the parenthetical part left out, i.e.


  As shown in Tyndall (1869), the sky is blue.


This is specifically when the name is reused, so it would still be


  As shown in another paper (Tyndall, 1869), the sky is blue.