Björn Klas Otto Rosengren is a Swedish businessperson who has been at the head of 5 different companies. Presently, he is Chief Executive Officer for ABB Ltd. and President & Chief Executive Officer at Sandvik Hyperion AB. In the past he occupied the position of President, Chief Executive Officer & Director at Sandvik Aktiebolag, President & Chief Executive Officer of Wärtsilä Oyj Abp, SEVP, President-Construction & Mining Technique at Atlas Copco AB Division President at Atlas Copco Craelius AB and Division President at Atlas Copco Rock Drills AB (both are subsidiaries of Atlas Copco AB), General Manager for Nordhydraulic AB, Marketing Manager at ESAB AB and Marketing Manager at ESAB AG. He received a graduate degree from Chalmers University of Technology.