So is the senior partner of a solicitor's firm, member of the Hospital Authority, the Council of the Lingnan University, and the Commission on Strategic Development.

[3] Between 2000 and 2003, So served on the Wong Tai Sin District Council and the Tsz Wan Shan Area Committee.

[1] In 2008 he was nominated Undersecretary for the Commerce and Economic Development under the 2008 Political Appointments System, at the 'cost' of having to renounce his Canadian citizenship.

In doing so, I have also had to give up my legal practice qualification in Canada where I still have friends and relatives," he said[2] On 28 June 2011, So was appointed to succeed Rita Lau as Secretary for Commerce and Economic Development after she resigned for health reasons in April 2011.

On 6 May 2014, So's office and home received delivery of faeces after he told Hongkongers to tolerate incidents where Mainland visitors freely defecate and urinate on the streets of Hong Kong.