Division K is the largest division in AERA representing more than 5,000 members. To become a member, you must first join AERA. New members - You can join AERA online. If you prefer to mail or fax in your membership application you will need to download a copy of the membership form (PDF). If you have any questions please contact the office at (202) 238-3200 or [email protected]. Current members - You can renew your AERA membership online. If you prefer to mail or fax in your membership application you will need to download a copy of the membership form (PDF). If you have any questions please contact the office at (202) 238-3200 or [email protected].