Dynamic information in Custom Fields

Okay,

I am working on a websites with many archived news articles. Many of these news articles have a different author. At the bottom of each page, there is a small paragraph telling information about the author of that particular article.

Now, this alone is easy. I am using the info blurb as a custom field.

However, as this comes to mind, the background information of each author may be subject to change over time. I would like a way to be able to change the bio of the user on the fly, rather than having to manually update each page’s bio.

I would use a PHP include, but they will not work within the context of an article, I have already tried as such.

Is there any way to work around this? A way so I can externally input the data that will be shown on the custom field, so I do not have to manually re-edit each page?

Thank you.