I worked for Stefan in a major cloud transformation program at E.ON. As a program lead, he was accountable for all different topics which come along with the initial set-up and integration of the public cloud services of Azure and AWS. These topics were organized into sub-projects such as architecture, network, cost management, purchasing, legal, security. The program established the foundation for E.ON’s cloud journey, the migration of many applications and services to the public cloud, and decommissioning of E.ON’s data centers. It has been an honor to work with Stefan because he has a remarkable talent in organizing and structuring complex topics from an end-to-end perspective. I hope to work with him again and can fully recommend Stefan as a lead for cloud transformation programs/projects.