Experience moderating: I was an admin on New-Athen's Minecraft server till the owner stopped hosting it.
Past punishments: I have been jailed once and served 2 days going down the cobweb tower in old spawn ( 1.7.3 by the way the new spawn is breathe-taking ). I did get a little frustrated and I apologized to those who I offended in any way (Mark577 mainly). No other punishments other than that.
I don't believe Brown deserves to me a mediator yet. I think he shows immaturity at times, I note that he posts on forums, but I don't think is behavior in-game lives up to that.
I've seen good things from brownsamuel, but I have also noted some activity that I wouldn't want portrayed from Staff. Once he cleans up some of this, I'm sure he'll make a great Mediator.