There is no limit to the number of faculty advisors a team can have, but each team needs at least one. The “advisor” mentioned in the rules refers to anyone who may advise the team, whether that’s a grad student, professor, or working professional. If this professor wants to become an official faculty advisor, then they should email eeri@eeri.org and cc silvana@eeri.org stating their intent to become a (secondary, tertiary, etc.) faculty advisor for the team.