RIP Ian Murdock, founder of Debian Linux which is what powers Tendenci. Without his work in the Open Source Community there could be no Tendenci Membership Software. This is a sad way to end 2015, but I would like to think Ian would want us to continue to invent and create greater freedom and transparency in the world.
I am not good at wording such a tragedy so I will leave you with the respectful post on the debian project blog and links to some news stories on the topid.