I am a volunteer media contact for the Wikimedia Foundation and Wikimedia UK. The best way to contact me is by email to firstname.lastname@example.org, or phone me on 07733 223 584 (usually goes to message).
(I used to be the press officer for Wikimedia UK, but I'm not now, though I still volunteer as needed. Contact them here.)
I am a volunteer sysadmin for the Rationalwiki Foundation. I write a Rationalwiki blog and post to the technical issues blog as needed.