Last time I had an appointment with one of the university advisors, she kept mentioning that she is going to "teach" later after the meeting. Long after the appointment I realized that I should have called her as "Professor XXXX" rather than "Ms. XXXX". However she does not have any scholars' websites, nor we could find out on internet that she indeed teaches some classes.
It is common in US to address college teachers as "Prof." I wonder if it is safe to address all university administrators as "professors", because if they are senior enough, most of them could have taught one or more college-level classes, orientation sections, or training sessions. Some of the administrators have ruling powers over the students in many scenarios, and it is not wise to insult them.