Unpaywall is a project of OurResearch, a nonprofit building tools to help make scholarly research more open, connected, and reusable. That's us in the picture (clockwise from top): Richard Orr (Twitter), Heather Piwowar (bio, publications, Twitter), and Jason Priem (bio, publications, Twitter).
You can learn more about how Unpaywall started in this Nature article, "How Unpaywall is transforming open science."
If you'd like to get in touch, we'd love to hear from you! To report a bug, please email us at support@unpaywall.org; for everything else, drop us a line at team@ourresearch.org