[2] During his first spell in Asia he worked in Quinam, Hirado and finally Tayouan (the capital of Dutch Formosa), rising to Chief Merchant (opperkoopman).
[2] In 1641 he resigned his position in Formosa to take up another in Hirado, but en route the Dutch were forced to relocate their factory to the artificial island of Dejima by the Japanese government.
[2] His work took him back to Formosa, then again to Japan, where he ordered a military action on the west coast of Luzon, which at the time was under enemy (Spanish) control.
When Nicolas Verburg was to be recalled from Formosa in 1653 it looked as if Carel Hartsinck was set to take over as Governor of the island.
However, Hartsinck's patron Governor-General Carel Reyniersz died on 18 April that year, with his successor preferring Caesar as the new Governor of Formosa.