How To Change Post Author Default

I am the admin of my site who has 4 other users, but I post the most often.

Every time I post, the default “Post Author” at the bottom of the “Add New Post” screen is always defaulted to “chris” when I want it to be always on “Dan” which is me, the admin. How can I change that?

I want to change the default name on the Add New Post, Post Author field.