Jack worked at the Bank of Canada for over three decades, holding a wide variety of positions on the financial stability and monetary policy sides of the institution. As Adviser to the Governor, he dealt with systemic risk, helping shape the bank's focus on improving critical financial-market infrastructure to ensure the bank's continuous functioning during a systemic crisis. He also helped update the bank's lender-of-last-resort procedures and tools in response to the 2008 financial crisis. Before becoming Adviser to the Governor, Jack lead what is now the Financial Stability Department of the Bank, which included responsibility for research and analysis of financial system issues, oversight of systemically important payments, clearing and settlement systems, and the collection of financial data from institutions. Jack also served as Chief Economic Forecaster at the bank, and was responsible for macroeconomic model development. Additionally, Jack was Chair of the Information Technology Review Committee, which governed the design, effectiveness, implementation, and value realization of the bank's information technology strategy. After leaving the Bank, Jack focused on helping financial institutions contend with the new regulatory initiatives aimed at reducing systemic risk.