NEW YORK: Paul Taaffe has joined Groupon as global head of communications nearly 13 months after resigning as global chairman and CEO of Hill & Knowlton.

“It's a disruptive company, and the people who love it really love it,” he said about Groupon. “I do think it could be better understood.”

Taaffe said the Chicago-based company has to increase public understanding of how it functions. Groupon attracted unwanted attention from federal regulators last summer over accounting metrics used in its ...