Dorffer joins from Prophet Brand Strategy where he was senior manager in the UK.
Prior to that he worked with Corporate Value Associates, a shareholder value-based strategy consulting firm, and before that with PricewaterhouseCoopers.
He is based in London in his new role, and will report to executive vice-president Joanna Seddon, who heads up Millward Brown Optimor from New York.
Forato is taking on the global role of senior vice-president of global clients and finance operations.
Millward Brown Optimor is the division of Millward Brown that provides strategic recommendations with demonstrated financial impact to major clients.
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