In the fast-moving world of digital marketing and e-commerce, only a few names manage to stand out through persistence and clear strategic thinking. One of them is Henry Duy (Vietnamese name: Doi Duy Khanh, born 1996), founder and CEO of GDT Agency, and the person behind the broader GDT Group ecosystem. Starting out as a hands-on digital advertiser, he has gradually built a multi-industry conglomerate serving hundreds of clients around the world.
Educational Foundation and Early Steps
Henry Duy began his career in digital marketing relatively early. From 2018 to 2022, he pursued in-depth studies in Digital Marketing and Conversion Optimization at institutions specializing in performance marketing. From 2022 to 2023, he continued developing his knowledge of Corporate Strategy and Multi-Brand Management through executive leadership programs. Most recently, starting in 2026, he began studying Information Technology and Applied AI, reflecting his ongoing commitment to staying current in a fast-changing industry.
Alongside his academic background, Henry Duy has also earned a number of professional certifications from globally recognized organizations, including a Social Media Marketing certificate from HubSpot Academy, as well as Google Ads Search, AI-Powered Performance Ads, and AI-Powered Shopping Ads certifications from Google Skillshop. These credentials reflect his serious investment in mastering modern advertising tools and trends, particularly as AI plays an increasingly important role in the digital advertising industry.
That said, according to Henry Duy himself, formal education is only part of his development journey. It was hands-on experience, directly running and optimizing hundreds of advertising campaigns for clients across various industries, that truly shaped his leadership capabilities and strategic vision.
Building GDT Agency and Expanding Into the GDT Group Ecosystem
In 2021, Henry Duy laid the foundation for GDT Group with the goal of building an integrated business ecosystem that combines digital services with operational capabilities across multiple industries. The first step in that journey was the GDT Agency brand, which specializes in providing agency ad account rental services for Facebook, Google, and TikTok, helping businesses, media buying teams, and affiliate networks build a more stable advertising foundation for their operations.
From that starting point, Henry Duy went on to expand his ecosystem into several other fields. In 2023, he co-founded Fanmen, a brand in the men’s cosmetics space. By 2025, the ecosystem had grown further with the launch of GDT Group Service, GDT Home in household goods, and BeautyTech in the beauty sector. Most recently, in 2026, he founded GDT Group Tech, marking the group’s expansion into information technology.
This multi-industry expansion isn’t unfocused diversification, it reflects a consistent strategy: building an ecosystem in which different business segments reinforce one another, spanning digital advertising, information technology, and consumer goods categories such as cosmetics and household products. This approach gives GDT Group a solid foundation to adapt to market shifts while creating synergy among its member businesses.
A Footprint in International Markets
Under Henry Duy’s leadership, GDT Agency has grown into an advertising brand with a presence in multiple markets, offering reliable agency ad account solutions that help scaling brands optimize their media buying operations. To date, GDT Agency has partnered with more than 500 advertising clients, manages over $20 million in monthly ad spend, and operates in 18 countries worldwide. A notable milestone in this growth has been the company’s expansion beyond Vietnam, with concrete steps in markets including the United States, India, the United Kingdom, and the Philippines, where GDT Agency has rolled out its services to help local businesses tackle common challenges in running advertising operations.
Beyond market expansion, Henry Duy and the GDT Agency team have also focused on building the operational infrastructure that supports advertising activity on Meta, Google, and TikTok, alongside establishing structured operating processes to ensure long-term scalability and consistent service quality. This has also served as the foundation for driving technology adoption and operational improvements across the businesses within the GDT Group ecosystem.
These efforts have been reflected in client feedback as well. Ethan Walker, founder of e-commerce agency WellCopy, has shared that working with GDT Agency helped his brand scale its advertising more steadily. Similarly, Jackson Christopher Meyer, founder of the Olyndra London brand, said the partnership gave him stable, high-limit advertising infrastructure to expand into international markets while maintaining compliance with policies across Meta, Google, and TikTok.
Leadership Philosophy and Strategic Vision
Henry Duy has shared a view that captures his leadership style well: “Sustainable business growth is built on strong foundations, disciplined execution, and long-term value creation.” This statement isn’t just a slogan, it runs through the way he manages the businesses within GDT Group, consistently prioritizing stability and long-term value over rapid, unsustainable growth.
Henry Duy’s long-term vision is to strengthen GDT Agency’s position as a trusted global partner in advertising infrastructure, while continuing to invest in performance marketing solutions that help businesses scale across major advertising platforms. To realize this vision, he focuses on three main pillars: expanding advertising infrastructure, improving service quality, and continuously refining the range of solutions offered to clients. He also places strong emphasis on building a capable team, developing long-term partnerships, and staying adaptable to emerging technologies in order to create sustainable value for clients.
Another notable aspect of Henry Duy’s working style is his active approach to sharing professional knowledge. He regularly participates in industry events and conferences related to digital advertising, and speaks directly about campaign optimization case studies at workshops. Beyond serving his own clients, he has expressed a desire to contribute practical value to the broader community of digital marketing professionals.
Looking Ahead
Looking back at the path so far, Henry Duy’s journey has been one of steady, step-by-step growth, moving from mastering the craft of digital advertising to building and leading a multi-industry business ecosystem. Starting from GDT Agency, his vision has expanded into GDT Group, a conglomerate now present across several sectors, from digital advertising and information technology to consumer goods.
Drawing on years of accumulated experience, along with a continued commitment to learning and adapting to emerging technology trends such as AI, Henry Duy and his team are continuing to grow GDT Group, with an eye toward serving even more markets around the world. For him, success isn’t measured only by scale or growth rate, but by the real value each business within the ecosystem delivers to clients and partners: stability, transparency, and long-term partnership in an increasingly competitive business landscape.
