Sequenom has promoted several members of its management team. William Welch is now the president and chief operating officer. He was previously senior vice president of diagnostics and has overseen the commercial operations of the MaterniT21 Plus test. Dirk van den Boom has been appointed executive vice president of research and development and chief technology officer from his position of senior vice president of research and development, which he has held since 2010. He joined the company in 1998.