Instead of 4 loops, how can I do it better?

Question

I want to grab all posts from an author under category X. Right now, I am using 4 separate loops to do this for 4 different categories. Is there a better way to do this? query_posts

Answer 1

Have a look at the category parameters of WP_Query

Answer 2

Please take a look at this answer, exchange get_comments with get_posts and use the include argument to filter only the posts from the categories you need.