Daniel Roullier is a French entrepreneur and the founder of Groupe Roullier, a massive, privately held agribusiness conglomerate specializing in plant, animal, and human nutrition (particularly fertilizers and soil conditioners). Born in Landébia, France, in 1935, he was raised in Saint-Malo, Brittany, a region famous for its maritime history and rich natural resources.

His entrepreneurial journey began in 1959 with a brilliant, local insight: he acquired a seaweed deposit near his hometown and founded the company Timac to convert marine limestone (maërl) into soil conditioners for local farmers. This hands-on experience in industrial chemical processing and agricultural needs formed the foundation for his massive, vertically integrated empire, recognizing the immense, stable demand for specialized nutrients.

Daniel Roullier's career is defined by his commitment to vertical integration and the continuous expansion of the Groupe Roullier into new markets and sectors. The company expanded from soil conditioners into various industrial activities, including fertilizers, animal nutrition, plant health, and food processing. This massive diversification across the entire nutrition chain secured the family's multi-billion euro fortune.

The Group's strategy focused on controlling production: in 1988, it launched its plastics business, Agriplas, to manufacture all its packaging and containers in-house. It expanded aggressively across Europe, South America, and North America, leveraging its unique technological expertise in nutrient processing. Roullier's long-term vision transformed his modest maërl grinding plant into a global industrial giant, with one of his daughters now playing a pivotal role in the company's senior management, ensuring generational continuity.

Daniel Roullier's social impact is structural, stemming from Groupe Roullier's role in improving agricultural productivity and food safety globally. The company's specialized fertilizers and animal feed supplements are essential inputs for the global food system, contributing to food security.

His personal philanthropy often supports educational and community initiatives in the Brittany region, reflecting his commitment to his birthplace. His career is a testament to the profitability of applying industrial precision and chemical processing to the essential agricultural sector.

Daniel Roullier maintains the professional, pragmatic style of a self-made French industrialist. His attire is consistently formal and high-quality, favoring tailored business suits. His aesthetic reflects the stability and seriousness of the large-scale industrial and agricultural sectors he commands.

Residing in Saint-Malo, Brittany, his luxury is the immense security and financial reward derived from his multi-billion euro fortune. His life is dedicated to the long-term stewardship of the Groupe Roullier, leveraging his founding insight into natural resources to build a global nutrition empire.