How to Show all the categories in which an Author has Posts – WordPress

This was a problem I came across when I was preparing an author page for a client. They wanted to show all the categories for which a certain user had written posts. For example, if there are 5 categories – A,┬áB, C, D and E, and the user had created posts for categories B and… Continue reading How to Show all the categories in which an Author has Posts – WordPress