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Morgan Twain-Peterson of Bedrock Wine Co. One of First California Winemakers to Become a Master of Wine

Posted on September 05, 2017

(Sonoma, Calif.)—September 4, 2017—Morgan Twain-Peterson MW, founder and winemaker of Bedrock Wine Co. and co-owner of Under the Wire, has become one of the first California winemakers to achieve the prestigious Master of Wine title through the Institute of Masters of Wine. Nigel Sneyd, currently director of E&J Gallo's International Winemaking group, which is based in California, also earned the title of Master of Wine this year.

Known worldwide for its intense rigor and extremely high standards, the Master of Wine examination consists of three stages: a theory exam, a practical tasting exam and an in-depth research paper studying a wine related topic. Morgan passed the theory and written exams in 2008 and submitted his final paper in 2017. For his final research paper he conducted a review of late 19th century planting practices, specifically the use of field-blending, in Californian vineyards and their relevance to today’s viticulture, based upon Bedrock Vineyard, planted in 1888.

This topic was the natural one for Morgan, whose foremost winemaking goal is to preserve and rehabilitate old vineyards across California. “These vineyards are living pieces of history,” Morgan describes. “If something has been growing for over 100 years, it not only deserves the respect of us humans, but it probably makes some darn good wine too.”

Morgan is now one of 369 Masters of Wine worldwide, and the first California Winemaker to join their ranks.

“Pursuing the MW provided an incredible framework for me to think broadly about winemaking, viticulture and business development while building Bedrock Wine Co. over the last decade,” Morgan says, “I cannot wait to go from the student side to the mentoring side-- hopefully I am only the first of many MWs to come from the talented winemaking ranks of California.”


Morgan was exposed to wine tasting at an early age; in David Darlington’s book Angel’s Visits, it is noted that “Morgan, at the age of five, could distinguish between Merlot and Zinfandel.” Under the tutelage of his father, Ravenswood's Joel Peterson, Morgan began making small lots of Pinot Noir at age five from fruit given to him by the Sangiacomo family. Educated at Vassar College and Columbia University with harvest experiences in Australia and Bordeaux, Morgan started Bedrock Wine Co. in 2007. Morgan is also co-owner of Under the Wire with his business partner Chris Cottrell, a sparkling wine project dedicated to making single-vineyard, single-vintage sparkling wines using the méthode Champenoise.


Started in 2007, Bedrock Wine Co. is a winery dedicated to preserving and rehabilitating old vineyards across the state of California. Morgan’s aim is to make personality-filled wines wrought from a small array of thoughtfully farmed vineyards, taking advantage of the diverse terroirs of California and the enormous range of styles that can result. “We are always exploring,” Morgan says, “from the heart of Oakville in Napa to the northern reaches of Mendocino and gold hills of Amador, the vastness of Lodi and the beaches of Contra Costa to every corner of Sonoma. Throughout all the wines, though, is a dedication to making wines that maintain poise while being infused with California sun. And, most importantly, that are delicious.”

Job Function: Winemaking

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