London—United Business Media, parent of CMP Media, announced Thursday that David Levin will succeed Clive Hollick as CEO in April 5, 2005. Hollick announced his retirement plans earlier this year. Levin, 42, is currently CEO of Symbian, a telecom software licensing company. Previously, he was CEO of Psion. Additionally, he spent five years with the international business publishing group Euromoney Institutional Investor, as COO.