John Montgomery served as Global Executive Vice President of Brand Safety at GroupM from July of 2016 until his retirement in 2024. GroupM is the world’s leading media investment group, and there Montgomery works to expand media brand safety best practices in international markets. Montgomery has been involved in the world of media investment since 1989, when he joined Ogilvy in South Africa and launched Mindshare in the region. Montgomery is chair of the 4A’s Media Leadership Council; has served on the Internet Steering Committee of the World Economic Forum (WEF), and co-chairs the anti-piracy initiative for the Trustworthy Accountability Group (TAG). He frequently represents the advertising industry to the U.S. Senate Commerce Committee.

Montgomery now resides in New York City.