Mark Grether

Dr. Mark Grether serves as Chief Executive Officer and Executive Chairman at Sizmek. Prior to Sizmek, he was the cofounder and global Chief Operating Officer of WPP's Xaxis, which under his leadership grew into the largest programmatic media company in the world, with more than $1 billion in revenue in just five years. Prior to Xaxis, he was Global Development Director of GroupM, the world's largest media investment group, where he was instrumental in setting up GroupM's digital trading desk across 10 countries. Mark also spent time in academia, teaching at university in Germany after receiving his PhD in Marketing from the University of Mannheim, until the lure of real-world marketing data drew him onto the ever-compelling advertising technology trajectory.