Membership to the Millennium Leaders Society is open only to the following:
- Young Atlanticist Alumni
- Millennium Leadership Fellow Alumni
- Atlantic Council Staff and Intern Alumni
- By-invitation only from Millennium Leadership Program staff
Membership also requires a full online application to be filled out (found here), and dues upon completion [minimum dues requirements range from $350 to $10,000 depending on age and career parameters]. Dues are due on an annual basis.