Yes. On the Manage Committee Members screen click the Click Here to add that member as a user in the system.
This will open the Setup Users section and you can enter the information to create a new user account for the committee member.
If this user will only be used as a reviewer to review applicants, select the Reviewer role type.
Otherwise, if they are staff members that need to have additional access to other areas, be sure to select a role type that has access to the Review Applicants icon on the Home dashboard.
(Click Save and Exit to save them as a user.)