Klaus-Christian Kleinfeld (born 6 November 1957 in Bremen, Germany) is the former chairman and chief executive officer (CEO) of Arconic. Kleinfeld is former chairman and CEO of Alcoa Inc., and former president and CEO of Siemens AG. Kleinfeld stepped down as chairman and CEO of Arconic on 17 April 2017. In October 2017, he was named director of Saudi Arabia's Neom initiative. It was announced in July 2018 that Kleinfeld would be promoted from director of Neom to advisor of Crown Prince Muhammad bin Salman on 1 August 2018, and that Nadhmi Al-Nasr would succeed him as director of Neom.