I'm trying to verify my schema.org implementation using Google rich data snippet preview, and am not sure if it's ok or not. This is an example. It appears there are no errors, and it does recognize my implementation, but the preview doesn't include any rich data. For comparison, when I put a linkedin link, the preview comes up with the rich data snippet:  (they have a Brooklyn, New York - Dean of Computer Science at Khan Academy rich snippet placement for him as you can see in this picture:What could be the reason my preview doesn't display any rich data? 
Why does Google rich data snippet preview not display any rich data from my schema markup?
seo;microdata;markup