Resizing Featured Image Automatically

As many already have expressed: THANK YOU for this wonderful theme. I'm sure it wasn't easy to develop and I'm sure all of us "newbies" don't make your life any easier.

I have a couple of questions, and they are below in order of importance:

1. What is the best way to account for image resizing for the featured image? Is there an automatic way one could employ so that some images don't get their heads cut off? I know I can manually resize until my heart's content, but I also know some themes (not as good as this one) are able to automatically fit featured images. Any little bit of advice will help... just looking to make life a little easier if it's possible.

2. Is there an way or function one could add so that there is an "author" link added, and when you click that link you are taken to an author page (with list of articles written)?
------I've managed to get my posts to display author name, but it is not clickable.

Thank you in advance and cheers, once again, for the theme!