Is it socialworkprn.com? (By the way, I think linking here is okay, it wouldn't be otherwise possible to do any reviews.)
If yes, well, the site looks overall pretty dated and cluttered.
The Find us on Facebook box is breaking the page layout, just remove it from the ul/li tags.
There is a lot of repeating elements, like the aforementioned Find us on Facebook box together with Visit us on Facebook banner in the sidebar. There are the Employers and Social Workers banners in the main content area that link to new pages and there is also a brief description for both categories a little below. I would put that together. There is a Locations link in the navbar and there is also a locations list in the sidebar.
I would at least unify the two navigational menus on top, replace the stock photography with actual pictures of the team (or at least some less obvious stock photos). I would completely do away with the sidebar and move the content from it to a footer.
As for supporting evidence, well, this is obviously just about opinions. (I mean, look at a typical Chinese website). But you can just show your boss the sites using Boostrap: http://expo.getbootstrap.com
Simple full-width layouts, no sidebars, no cheesy stock photos, nothing is duplicated, information is very concise.
Hope this helps