He voted to ban corporate, union, and out-of-province campaign contributions in motions that were ultimately defeated, advocated for better waste management and transportation policies, and against new mega-projects.

[6] After 10 years as a councillor, Clark launched a bid for mayor in 2016, challenging four-term incumbent Don Atchison, who was again seeking re-election.

[2] Clark ran on a platform of better planning for future growth, including economic and environmental sustainability, as well as more focus on issues of social justice and inclusiveness.

[3][8] Despite trailing in the polls late in the campaign, Clark was elected mayor, defeating Atchison by a margin of over 3,000 votes.

[22] Clark's two terms were marked by economic challenges, including the pandemic and significant cuts to provincial funding beginning in 2017.

[4] He stated that he was most proud of helping to build relationships throughout the community and changing the city's reputation as one that tended to lose its young professionals.

After a judge ruled in 2023 that the security guard had acted within his rights, the crown prosecutor criticized Clark and Federation of Sovereign Indigenous Nations Chief Bobby Cameron—who had also spoke out about the incident—for releasing statements about a matter that was before the court.

[1] When Clark announced that he would not be seeking a third term as mayor, he cited a desire to spend time as a parent with children at home while not also being a public figure.