[6] Hsu is a long-term member of SWITCH, a Kingston-based not-for-profit association that promotes local job creation and green economic growth.

Hsu acted as treasurer of the Kingston and the Islands Federal Liberal Association from 2007 to 2010, and was an active member of its policy committee.

[8] During this time, he supported the 2007 provincial and 2008 federal Liberal campaigns for John Gerretsen and Peter Milliken, the longest-serving Speaker in the House of Commons.

Following Milliken's announcement in summer 2010 that he would not seek re-election, Hsu won the Liberal nomination in November to be the party's 2011 candidate.

"[15] In August 2014, Hsu announced that he would not run for re-election in the upcoming 2015 federal election, citing the burdens of political life on his young family.

Hsu also spent much of his time advocating for the return of the Canadian Prison Farm System which was re-instated, albeit in a more limited format, in 2019.

[21] In 2020, Hsu announced his campaign to represent Kingston and the Islands as the Ontario Liberal Party candidate in the upcoming provincial election.

He went on to say, "I want to offer voters someone who has a proven record representing constituents, and also has experience working with scientists, climate researchers, economists, engineers and entrepreneurs.