There is no information available about a U.S. nonprofit organization named "Six R" with EIN 274328416. The search results do not provide relevant data on this organization. Therefore, it is not possible to create an article about it at this time.

[1] https://sixr.tv [2] https://www.goodreads.com/book/show/1963466.Forces_for_Good [3] https://sprc.org/online-library/member-retention-participation-tip-sheet-the-six-rs-of-participation/ [4] https://www.fastcompany.com/693588/six-practices-high-impact-nonprofits/