"We're very grateful for Gary's contribution to TPF over the past three years, and we wish him well for the future," said Tony Wood, TPF Group marketing and communications director.
Kiernan, who left the firm last week, was unavailable for comment as PrintWeek went to press, but it is believed he plans to stay in the industry.
Phil Brooks, managing director of TPF Direct, will take over as acting group operations director.
Kiernan leaves Print Factory
Gary Kiernan has resigned as group operations director at The Print Factory.