All you Presidents out there... just make sure you use your power for good, not evil.
JHB, I think a better word is influence, not power. I also think the Principal and the President are often the people who have the most influence on the direction of a PTO - by far. Which is #1 vs. #2 would be different for each group/dynamic.
Anyway... Mustang Mom,
If your groups by-laws don't speak to the situation, then there is nothing preventing you from serving on the board.
However, our groups' Charter specifically says that the 5 Exec Bd positions must be filled by parents/legal guardians. If the parent is also a teacher that is OK, but a teacher (without parental responsibility) is not allowed to serve on our board. But different groups are free to craft their rules for their own situation.
And finally.... Roof 6 Pack,
It seems to me that if you are on the board of a PTO, you have a fiduciary responsibility to act/decide for the benefit of the PTO. Therefore you are not acting as either a parent or as a staff member, but as an Executive Officer of the organization.
I also recognize that is easier said than done especially for the tough calls.