Name tag for staff on science conference?

Question

I am making name tags (badges) for international science conference. There are three category of participant:

1. Speakers - they will speak the reports.
2. Visitors - they will listen to the speakers.
3. Third category (I don't know how right it call) - they will to provide conference, to evaluate reports, to regulate discussion etc.

In my native language this is literally called Organising Committee. But I want to do badges that will meet to standards of english language.
The question: How properly to call third category of participants? To my mind - if them call like staff, then it will be insulting for professors and other important persons who will be in the comission.

Answer 1

Organizing Committee Member would be perfectly acceptable in English. However, long titles are not often used on name tags/badges, so you might want to shorten it to Organizer, or perhaps Moderator. Sometimes, this role may be referred to as Referee, but I've encountered objections to that because conferences are not sporting events.

As @JayA.Little notes in the comments, Coordinator is also a valid possibility.

Staff is not insulting or demeaning, unless you're thinking of confusion with the people who manage the facility (e.g., the people you talk to when a lightbulb is out).