| Guillermo Ulacia | |
| Birth Name: | Guillermo Ulacia Arnaiz |
| Occupation: | Vice President of Aceralia |
Guillermo Ulacia Arnaiz serves as Vice President of Aceralia Corporation Siderurgica SA.[1]
Arnaiz served as the chief executive officer of Gamesa Corporación Tecnológica from December 1, 2005. He has previously served as Vice Chairman of General Motors Corp, Spanish unit; he also served as Executive Chairman since July 2006 until October 2009.
Arnaiz worked for 10 years as a Director of flat steel products at Arcelor before becoming Vice President.
Arnaiz serves as Co-Chairman of the Aceralia Management Committee, member of the General Management of the Arbed Group.