Guillaume Dumortier Email & Phone Number

Guillaume Dumortier is a Co-Founder & CEO at Maestrix.ai based in San Francisco Bay Area, United States, North America. I'm Guillaume — a Fractional CMO, growth strategist, and builder of AI-powered marketing tools for founders and small teams. With 20+ years of experience across Tech, Telco, Retail, and CPG, I've guided global brands like L'Oréal, Red Bull, Chanel, and Danone, as well as high-growth startups like Life360 and Algolia, and celebrity ventures including Brad Pitt's. After 18 years in Silicon Valley, I developed the Growth Marketing Fit® framework to help startups accelerate traction and scale confidently. Today, I lead Maestrix — the first comprehensive GenAI marketing platform built specifically for lean teams seeking strategy, speed, and structure. If you're tired of vague marketing advice and want actionable strategies that drive measurable growth, you've found your partner.