About Us

In 1992, Peter Pfendler planted the first vineyard on our family’s Sonoma Mountain ranch with the goal of creating beautiful, hand-crafted wines. Since then, we have planted three additional vineyards that flow from the peak of the mountain to its base. The maritime influence of the Sonoma Coast touches each of our vineyards differently, providing a broad palate of exceptional, cool-climate flavors.

While Peter is no longer with us, his vision is the guiding star for the quality and beauty of the wines that we produce, and we celebrate his memory with each vintage. My goals are to continue to grow the finest-quality grapes for our wines, to further Peter’s legacy of wildlife and land conservation, and to foster in our son, Nicholas, a love of our vineyard, our ranch, and in his father’s words, “this big, green, beautiful Earth.”

Kimberly Pfendler


Beginning with the 2017 vintage, Justin Harmon has joined the Pfendler Vineyards family as Winemaker. A chemical engineer graduate from University of Pennsylvania, Justin’s winemaking training began in his hometown of Chicago, where an obsession and curiosity for wine inspired him to study enology textbooks published by UC Davis, while also fermenting wines in his basement.

After traveling to Sonoma County to work as a harvest intern for two vintages, he established Argot in 2007 from just a single ton of crushed Syrah. In 2011, he relocated to Santa Rosa to pursue winemaking full-time. As a close friend and mentee of Pfendler’s founding winemaker, Greg Bjornstad, Justin has had extensive exposure to Pfendler wines over the past decade, tasting each vintage from barrel and bottle.

“Pfendler Vineyards has always made elegant wines that put the vineyard first,” says Justin. “I am thrilled for the opportunity to work alongside Kimberly and make wine from her incredible property.”

Justin Harmon

Winemaker (2017-Ongoing)

Pfendler’s founding Winemaker Greg Bjornstad takes a hands-on approach during the growing season and employs gentle practices in the winery to allow an honest expression of the Pfendler’s vineyards. Bjornstad has a degree in Viticulture from UC Davis. In 1991, Greg was selected for the coveted Château Lafite Rothschild internship, where he observed that great wine is inextricably linked to the vineyard. The process is one.

Bjornstad has held leadership roles in viticulture and winemaking for Newton Vineyards, Joseph Phelps Vineyards and Flowers Estate, and has consulted for many of the Sonoma Coast’s most prestigious vineyards. Greg has brought a strong non-interventionist approach to the Pfendler wines, and shares Kimberly’s passion for making wines that honor her family’s land. Greg Bjornstad will continue to support Pfendler’s vineyard management by providing data-based grape growing context through eVit, his viticulture database software startup.

Greg Bjornstad

Winemaker (2007-2016)