The Secretary General for the ASEAN secretariat at the moment , from the year 2008-2012, is Dr. Surin Pitsuwan from Thailand.
For those people who are interested to work with the ASEAN Secretariat may look for any job vacancies in the internationally recruited professional ranks in ASEAN publications or simply on the ASEAN websites. Applicants should be of Asean nationals.
As for the locally recruited staff, these are only open for the ASEAN nationals resident in Indonesia.
P/S: Dr. Surin has an amazing profile. If you're interested to get to know him better, check out this website : http://www.aseansec.org/CV-SGSurin.pdf