This question is the inverse of another question. In corporate gmail, I know how to view a list of members for a particular group, but how do I perform the reverse of this? That is, how do I find out which groups John Doe belongs to?
Use case - I need to send an email with a database question. I know that John Doe is a Database Administrator, but I'd rather email the group of DBAs instead of just John. In Outlook, this could be accomplished by double-clicking on John's name; then his email groups would be listed under Memberships (or something like that).