Mark Grether

About Mark Grether

Mark is the CEO of Sizmek, where he is focused on guiding the company and its leadership team and accelerating the growth of the business. Prior to Sizmek, Mark was the co-founder 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 a university in Germany after receiving his Ph.D. in marketing from the University of Mannheim, until the lure of real-world marketing data drew him onto the ever-compelling advertising technology trajectory. Since 2011, Mark has lived in New York City with his wife and two sons, who he attempts to one up at soccer each weekend—but they’ve got mad skills.