GreenDesk® has features for managing the team members of a project. It distinguishes between Login Users (who have access to GreenDesk and have one or more pre-defined 'access roles') and Actor elements (human resource roles on a real-world project, which can be created freely, and can be allocated to GreenDesk activities to help track credit completion for project management).
Login Users may create one or more Author model elements (user profiles) through the lifetime of a project. An Author element is used which are used to sign-off on a Credit Submission Form.
View this video to learn about the difference between these different concepts in GreenDesk.