New York—Branding agency Sullivan announced it has formed Imprint, a custom content company. Andy Seibert, current chairman of the Custom Content Council, will serve as managing partner of the company. He was most recently president of Dow Jones Content Lab. “Forming Imprint was a natural move for us as we continue to evolve and seek to offer our clients a 360-degree branded experience,” said Barbara Apple Sullivan, managing partner of Sullivan, in a statement.