Klein holds a diploma in International Business Administration from the University of Cooperative Education in Mannheim, Germany. He started his career at SAP in 1999 as a student. He held various positions in Active Global Support Operations, Services Operations, and Global Controlling, and served as Chief Financial Officer of SAP SuccessFactors (2011-2012). In 2014, he became Chief Controlling Officer and on April 1, 2016, he was named Chief Operating Officer. Since October 11, 2019, Christian Klein and Jennifer Morgan were Co-CEOs of SAP SE; on April 20, 2020, Christian Klein was appointed sole CEO of SAP SE.