Guy R. Powell is a marketing strategist, analytics expert, and author specializing in marketing ROI, marketing mix modeling, prescriptive analytics, and AI-driven market research. With more than 20 years of experience working with global brands across multiple industries, he helps organizations understand what truly drives growth—and how to measure and optimize it.
As the founder of ProRelevant, Guy focuses on delivering data-driven marketing strategies that move companies beyond intuition to proven performance. His expertise includes marketing mix modeling (MMM), customer analytics, sales optimization, and AI-powered solutions such as synthetic market research and digital twin modeling. His work consistently centers on one goal: maximizing return on marketing investment through actionable insights.
Guy is the author of several influential books on marketing and analytics, including Marketing Calculator, The ROI of Social Media, The Marketing Machine, The Post-Covid Marketing Machine, and his upcoming book, The AI Marketing Machine. These works provide frameworks for marketers seeking to integrate analytics, strategy, and emerging technologies like artificial intelligence into their decision-making.
He is also the host of The Backstory on Marketing and AI, a podcast featuring interviews with leading marketers, executives, and innovators shaping the future of marketing, AI, and customer insights.
In addition to his professional work, Guy is actively involved in the marketing community through the Atlanta Chapter of the American Marketing Association (AMA), mentorship, and teaching at Emory University Goizuetta Business School. He also serves on advisory board of the marketing department of the Chattahoochee Technical College.
Beyond marketing, Guy is an amateur historian focused on the Shroud of Turin, hosting The Backstory on the Shroud of Turin and serving on the boards of Othonia, STERA, and SEEC. He is also the author of The Only Witness, a historical exploration of one of the world’s greatest mysteries.