Today, Marc works in optics manufacturing at ZEISS. As a project manager, he accompanies the path of high-performance mirrors through production – from material delivery to customer delivery. In the process, the optics pass through many stations over a period of months. For example, the pre-contouring and fine contouring, polishing and coating, as well as numerous measurements. "Some mirrors slip through production like butter, others need more attention," Marc says with a smile. "But I know each and every one, that's my job. I coordinate and monitor processes, report to management and customers, and initiate action when unforeseen events occur." What might such events look like? Marc ponders for a moment and then talks about dust particles and high humidity, nanometer-fine scratches, software crashes and effects of a pandemic. Yet so far he has been able to master every challenge.