Günter-Friedrich Maas has taken over management of the business unit Chemilog at the Hoyer Group effective from the beginning of 2010. He succeeds Ortwin Nast, Hoyer chief executive officer, who has been in charge of the unit as well as CEO the past few years. Maas joined Hoyer three years ago as director-Region Central and was most recently also responsible for intermodal transport and sales. He also is managing director of Hoyer Nederland BV, Rotterdam.