Little help please, w/ custom user group and author info

I just thought of something. I'm on the SETI team, as are moderators and regular members. Obviously, we all can't be part of the same user group. If I add multiple user groups, like SETI_Admin, SETI_Mod, SETI_SuperMod, and SETI_Member, how would the above little code be made to check all those groups?

And assuming I correctly set permissions for each group, would putting a Moderator in another group have any effect on his/her abilities?