For now my activities on commons consist mainly of uploading photos.
I'm an administrator.
Additionally, I'm en:User:CryptoDerk, an administrator on the English Wikipedia. See my page there for more personal info.
If you need to find me quickly (or not), I'm always in the IRC channel #commons.wikimedia with the name Derk or CryptoDerk. Sending me a message over IRC is the best way to contact me if you cannot or do not want to use my talk page.