I have had the pleasure of collaborating with Stefan on several occasions, most recently on our recent book manuscript and an ESE presentation. Stefan is exceptionally knowledgeable in software architecture, and the insights he has gained from more than 25 years of working in the software industry are truly invaluable. His feedback on our manuscript was incredibly detailed and thorough, and his feedbacks greatly helped us improve both the technical content and the overall quality of the manuscript. Beyond his technical expertise, I was particularly impressed by his professionalism, organization, and collaborative approach. He is thoughtful and dependable, making our collaborations productive and enjoyable. He would be a tremendous asset to any software organization.