William Keiper, CEO of payments solutions provider Hypercom (Phoenix), is stepping down as CEO of the company and will be resign as a member of the board of directors effective Aug. 15, 2007. Philippe Tartavull, president of Hypercom, was promoted to chief operating officer effective immediately. Ian Marsh, EVP and managing director, Asia Pacific Region of the Western Union Company, was appointed a member of the board. Until a new CEO is found, the Hypercom will be directed by an interim office of the chairman comprised of Daniel Diethelm, chairman, Philippe Tartavull, president and COO, and Thomas Liguori, CFO.