This morning, we announced a change to our executive leadership at Sizmek. As Sizmek’s new Executive Chairman, I’ll be spearheading the execution of our strategy and growth as the premier independent ad management company in the ad tech space. I am writing to introduce myself, and share some thoughts on why I’m excited to be leading the charge at Sizmek.

First, a little about me: Most recently, I was the cofounder and global Chief Operating Officer of WPP’s Xaxis, the largest programmatic media company in the world, where I worked with the largest brands across a variety of industry verticals, including automotive, retail, and CPG. Prior to Xaxis, I spent three years as Global Development Director of GroupM, the world’s largest media investment group.

Sizmek, a company I’ve watched grow for many years, has revolutionized how marketers and advertisers balance technology and creative on behalf of their clients—and we are about to do more. It’s an exciting moment, and I look forward to leading the company’s top talent and continuing to grow the business, while providing the highest level of service to our partners who rely on Sizmek’s open ad management capabilities for their multiscreen campaigns.

I’d also like to thank Neil Nguyen, Sizmek’s CEO and President, who will be staying onboard through the end of April to assist in the transition. Through his leadership over the past 13 years, Sizmek has become the market’s largest open ad platform and second largest server of digital ads.

I look forward to working with our clients and partners in 2017 and beyond.

Mark Grether


Executive Chairman

Mark Grether