Germany's Merck KGaA will promote its deputy chief executive, Stefan Oschmann, to the top job next year to replace Karl-Ludwig Kley, Manager Magazin reported on Friday, citing company sources. FRANKFURT: Germany's Merck KGaA will promote its deputy chief executive, Stefan Oschmann, to the top job next year to replace Karl-Ludwig Kley, Manager Magazin reported on Friday, citing company sources.