From satoshi to sirius, theymos, badbear, and last was cyrus.
Satoshi created the forum on Nov 22, 2009, and was head administrator until almost 2011. Then Sirius was head administrator until 2012, which is when I took over.
Congratulations BadBearCongratulation Cyrus !There's been a few other admins which were not "head" admins such as:
Raoul Duke who was last active in 2019. My memory fails when they were no longer a staff member, but I believe there does exist a thread when they were made an admin.