Assign categories directly to a presenter when their sessions are not yet confirmed, or when the category belongs to the presenter's profile as well as their sessions. The field uses your event's category label, which may be customised.
Add categories to the presenter
Make sure categories are enabled for the event and create the categories you need under Content & Schedule > Categories.
Go to Content & Schedule > Presenters and choose Actions > Manage Presenter.
In Details > Organisation and labels, select the relevant Categories.
Select Save and Close.
Check public visibility
Categories can help attendees find eligible presenters on public category and presenter views. A category assignment does not make an inactive or otherwise hidden presenter visible. If the presenter has no linked sessions, review public visibility settings and Show Speakers With No Talks?. Public directory topics include direct presenter categories and categories from eligible linked sessions, so you usually do not need to duplicate categories already attached to those sessions.