Who is Rob Jetten, tipped to become the next Dutch prime minister?

The race between anti-immigration Geert Wilders' far right Party for Freedom and the centrist D66 is still neck and neck. However given all major parties have ruled out forming a coalition Wilders, it is likely the energetic Rob Jetten of D66 will become the countries next prime minister - even if he comes second. So who is the 38-year-old and what is his agenda?