Veteran Series: For Matt Clark, Investing Is a Matter of Principle A secret of the South Dakota pension plan chief’s success: putting a premium on inculcating strong values among staff members. Editor’s Note: Matt Clark is one of the stellar CIOs who will be featured on our upcoming Power 100 list, to be released in February. South Dakota Investment Council CIO Matt Clark Few pension fund leaders are as universally respected as Matt Clark. Ask an allocator who they admire in the industry and, chances are, the investment chief from South Dakota will be one of the first mentioned in a short list of people.