As I told you earlier, you should write “the president of the Treasury Board”.
It should also be noted that the Department of Canadian Heritage and the Treasury Board Secretariat have different mandates. The Department of Canadian Heritage is responsible for working with communities, understanding their needs, administering funds and distributing them. The Treasury Board Secretariat implements policies for other departments. Its mandate is to monitor the departments. That's different.
I would ask my colleague Carsten Quell from the Treasury Board Secretariat to elaborate.