TMA > Members Members Why Join? (Membership Benefits) Member Categories Member Directory Member Portal Apply for Membership: Applicants for membership must submit a written application for membership. To begin the application process, please contact Celia Besore, Vice President of Membership and Programs, at 703-242-4670, Ext. 18, or firstname.lastname@example.org. Renew Membership Memberships expire on the 31st of December. Renew Online or contact email@example.com.