I'm not aware of all of them, but considering this[1] post from theymos, allegedly, the account altoid belonged to him[2]. Apparently, he also had an account on Stack Overflow as well[3].

---

[1]https://bitcointalk.org/index.php?topic=881488.0
[2]https://archive.is/WGtWF
[3]https://archive.is/igUtH