[1] After his retirement, Clark worked as an adviser for Ontario Premier Kathleen Wynne and helped introduce beer and wines into grocery stores and partially privatize the electricity distribution company Hydro One.
[4] In 1985, he joined Merrill Lynch, and three years later was appointed chairman and chief executive officer of Morgan Financial Corporation.
As CEO of Canada Trust he introduced same sex benefits in 1994, a first among companies and governments in North America.
Under the Wynne government in 2015, Clark worked as an adviser and helped partially privatize Hydro One, the electrical distribution company.
Clark was a member of the Chair's Advisory Council for Habitat for Humanity Toronto and has been a lead supporter.
Clark also supports to WoodGreen Community Services, an organization that delivers programs to build sustainable communities in the Toronto area and has been a lead donor to Homeward Bound, a programme to help single mothers get a post secondary education and permanent jobs .
[citation needed] In 2014, Clark was elected to the board of trustees of US public policy organization the Brookings Institution.
[13] Clark also received Egale's Leadership Award in honour of his leadership in supporting LGBT communities, and the inaugural Catalyst Canada Honour, awarded to individuals who have made a critical and visible difference to women's advancement.
That same year, he was acknowledged by GTA Association of Fundraising Professionals (AFP) with the "2011 Outstanding Philanthropist" award.
Then in October 2014, the Harvard Business Review named Clark on its list of the 100 Top Performing CEOs in the World, ranking him #47.
[citation needed] Clark has been asked to speak at a number of prominent international events on a wide range of topics, including the Canadian economy, the banking industry, leadership values, and the importance of creating a diverse and inclusive culture in the workplace.