Hey, I'm SeventhSentinel (or SevSent). I've been involved in SRB2 since around 2010 or so. I make maps, write music, and learn all I can about what makes SRB2 great. I frequent #srb2fun when I'm active in the community, so if you need to talk to me for some reason, that's your best bet.
You can also find me on Twitter, Tumblr, SoundCloud, and the SRB2MB under this name.