Our Team
Senior Winemaker
Sebastian Donoso
Sebastian Donoso is a Senior Winemaker at Bonterra Organic Estates, where his passion for sustainable and organic winemaking drives his work. Influenced by his love for astronomy, he views nature from a unique perspective, deepening his commitment to sustainability. He joined Bonterra in 2017, and today oversees the production of the Bonterra Estate and Single Vineyard Collections, as well as crafting wines for Alea Fina, Sanctuary, and the 1000 Stories brand. Previously he was a winemaker at Campovida, and prior to that an enologist and assistant winemaker at Saracina, both based in Mendocino County. Sebastian was born in Chile and moved to the U.S. at age 14. He holds a Bachelor of Science in Enology from California State University, Fresno, and later earned a certificate in Biodynamic Agriculture from the Biodynamic Agricultural College in the U.K.
“Integrity and transparency are a key part of the culture,” he says, reflecting that the winery’s numerous third-party-audited sustainability certifications “are embedded in all of us.”
Senior Winemaker
Margaret Leonardi-Pruett
Margaret Leonardi-Pruett is a Senior Winemaker at Bonterra Organic Estates, where she brings her technical expertise and meticulous approach to crafting a core portfolio of organically farmed wines. Since joining Bonterra in 2015, Margaret has contributed to the winery’s leadership in organic viticulture, reinforcing its 30+ year legacy of consumer favorites. Previously, she served as a winemaker for Fetzer and 1000 Stories, and at Bronco Wine Company, where she introduced organic labels like Green Fin. Raised on an organic dairy farm in Humboldt County, California, Margaret developed a deep appreciation for organic agriculture, and she loves the unifying power of wine. She holds a degree in Agribusiness with a focus on Marketing and Wine & Viticulture from Cal Poly San Luis Obispo.
“Every bottle of Bonterra offers the chance to transform a meal into a celebration. It’s beyond winemaking; it’s about making wines that taste great and are great for the environment.”
Senior Director of Regenerative and Organic Development
Joseph Brinkley
As Senior Director of Regenerative Organic Farming at Bonterra Organic Estates, Joseph Brinkley oversees all 850 acres of our Regenerative Organic Certified® vineyards in Mendocino County. With a background in economics from Virginia Commonwealth University, Joseph shifted his career focus to sustainable agriculture to align with his passions, earning a degree in Horticulture from Virginia Tech. Since joining Bonterra in 2013, he has been instrumental in driving our winery’s impact leadership through his deep knowledge of regenerative organic farming. Joseph’s career has included training at the Josephine Porter Institute, a certificate in Holistic Management from the Savory Institute, and roles at celebrated wineries including Grgich Hills, Spottswoode Estate, and Roederer Estate. Beyond his work at Bonterra, he shapes policy on climate-smart farming, advocates for healthy soils legislation, and chairs the Organic Trade Alliance’s Wine and Sustainability Councils.
“Some say regenerative organic farming can’t be done at scale – but we’re modeling the way”