Over the past three and a half years, the job of senior civil servant Bowen Leung Po-wing was to build and create: new land for flats, infrastructure facilities and a society with cleaner water and air.
For the next three years or so, Mr Leung will be doing a job he once compared with visiting the the South Pole.
As the first head of the SAR Office in Beijing, he will be expected to cultivate contacts across the country and help Hong Kong people understand the mainland better.
'We have had more than 100 years of colonial rule and most of us do not quite understand how things operate in the mainland. Many forgot that the policy of 'one country, two systems' has two aspects . . . They have some reservations about 'one country'.
'We need to see how our development can integrate with that of the hinterland,' said Mr Leung, 49.
A low-key private secretary to last Governor Chris Patten between 1992 and 1995, he sat in on the most secretive meetings at Government House where the strategy of dealing with Beijing was developed.