I am wondering if Google supports rich snippets for all schema.org data types as is possibly suggested by https://support.google.com/webmasters/answer/146645
Abram, I think this page might help answer your question: https://support.google.com/webmasters/topic/2643152?hl=en&ref_topic=30163 Google does limit which structured data markups they display rich snippets for, so not all markups will generate a snippet.
In regards to your other question about the person rich snippet, usually that snippet is generated through the use of the authorship tag, which is something completely different than schema. For more on that, you can check out this page: https://plus.google.com/authorship
I hope that helps answer your questions.