In the Genesis Framework the post info can usually be removed by using this code snippet from http://my.studiopress.com/snippets/entry-header/
remove_action( 'genesis_entry_header', 'genesis_post_info', 12 );
The Whitespace Pro theme, however, represents a little exception.
The Whitespace Pro functions.php file is repositioning the entry meta with a priority of 7.
This means that the usual code snippet cannot work.
Luckily the solution is very simple.
Just change the priority in the code snippet:
remove_action( 'genesis_entry_header', 'genesis_post_info', 7 );