Although formally privately constituted bodies, the SEF and the ARATS are both directly led by the Executive Government of each side: the SEF by the Mainland Affairs Council of the Executive Yuan of the ROC, and the ARATS by the Taiwan Affairs Office of the State Council of the PRC. The heads of the two bodies, Lin Join-sane and Chen Deming, are both full-time appointees and do not hold other government positions. However, both are senior members of their respective political parties (Kuomintang and Communist Party of China respectively), and both have previously served as senior members of their respective governments. Their deputies, who in practice are responsible for the substantive negotiations, are concurrently senior members of their respective governments. For the June 2008 negotiations, the main negotiators, who are deputy heads of the SEF and the ARATS respectively, are concurrently deputy heads of the Mainland Affairs Council and the Taiwan Affairs Office respectively.