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Our Team

The Shadybrook People


Alice and David Alkosser


Alice first ventured into the Napa Valley while studying Food Chemistry at UC Davis. She developed an interest in wine and included viticulture and enology as part of her studies.  After completing her degree, Alice pursued her career in research and development and worked in that field for several well known national brands.

David studied engineering at Cal Poly and started his working career as an industrial engineer. He always had an entrepreneurial eye and aimed to own his own business one day.

After getting married they realized the potential of real estate ownership, investment, and management. Pooling their resources, they founded their own company and worked together, starting a business that David would later grow into a successful enterprise spanning several states.

Both Alice and David have long possessed a love affair with land. After a series of acquisitions and redevelopment projects in the hills of Coombsville, they decided to create an estate where all of their dreams could be realized. In order to fulfill their vinous passion with their pledge to excellence, the Alkossers set the quality bar high with Shadybook Estate and assembled a talented team with more than 150 years of combined experience in vineyards and the wine industry. Since their first vintage release in 2010, Shadybrook Estate wines have risen to the top in local, national and international wine tasting contests.

Hospitality, Sales and Marketing

Kristine Youngberg

General Manager

Originally from New Orleans, LA, Kristine has a background in both wine and hospitality.  With an MBA from the College of Business and Public Policy at the University of Alaska Anchorage, and a Bachelor of Science in Management from the A.B. Freeman School of Business at Tulane University, she has worked extensively in operations, marketing, brand management and business development. 

Shortly after college, she moved to Anchorage, AK where she started her career as the Catering Sales and Convention Services Manager at the Sheraton Hotel in Downtown. During that time, she was able to expand her food and wine education, culminating in the completion of the Introductory level Sommelier certification through the Court of Master Sommeliers. From there she relocated to Florida to spend time in the company’s resort division representing their portfolio of hotels and resorts on Sanibel and Captiva Islands before moving back to New Orleans to be closer to family. While in New Orleans and subsequently Tampa, FL after Hurricane Katrina, Kristine served as Director of Sales and Marketing for two different shipwreck exhibits curated by Odyssey Marine Exploration, the World leader in deep sea marine archaeology and shipwreck exploration at the time, but wine and Napa was calling.

In 2008 she made the leap and moved to Napa, opening and operating the AVIA Hotel in downtown Napa as the GM and Wine Director from 2009 to 2012. A sommelier and level 3 WSET, with a passion for building dynamic teams and brands focused on exceptional customer service and strategic innovation, Kristine and her team led the AVIA Napa to achieve recognition as one of Conde Nast’s top 200 hotels in the United States during her tenure.  Deciding it was time to follow her passion for the wine and spirits industry full time, she spent several years as the Direct-to-Consumer Portfolio Marketing Manager for a family of iconic CA wineries and luxury import brands before moving on to expand her knowledge of the spirits industry as well serving as the Marketing Director for the Bently Family of Companies to help develop and launch their new Estate Distillery.  Always up for an adventure, her next move was right into the heart of fast cars and fine wines as the Brand & Communications Director for an award-winning boutique winery and championship motorsports racing team in Petaluma, CA. 

Prior to joining our team, she was the General Manager of a boutique, family-owned winery, in St. Helena for 4 years where she completed multiple capital improvement projects, including the development of new event and entertainment spaces, two vineyard redevelopment projects, and multiple new DTC initiatives. In addition, Kristine helped develop and launch a new series of wines to replace the lost 2020 vintage due to the wildfires as well as their first vintages of sparkling wines.

Her community involvement includes being a graduate of Leadership Napa Valley and serving on the Board of the Rotary Club of Napa to volunteering as a wildlife rehabilitation volunteer for Napa Wildlife Rescue. A lover of travel and the outdoors, when she is not working, she can usually be found engaging in a range of activities from baking and gardening to fishing, but always with friends and family. 

Justin Preiser

Sales and Hospitality Director

Justin transplanted his roots to Napa in 2006, where he co-founded a concierge magazine focused on discovering and highlighting the best wineries and restaurants in Napa and Sonoma Wine Country. Immersed in the world of wine and gastronomy, Justin's journey sparked a profound passion for both. After years of working in the wine industry in multiple capacities, he developed, with his family and close family friends, their own boutique wine label, where after several years of working and studying with a fantastic team, he became the winemaker in addition to growing their clientele through his role as Director of Operations for their tasting room in Downtown Napa. 

He is now excited to bring his experience to Shadybrook Estate, to collaborate with our amazing team, and continue to build upon the tradition of excellence in hospitality, winemaking, and stewardship of the land that makes this boutique, family owned property in the highly sought after Coombsville AVA so special. 

Kayla Delgado

Wine Club Manager

With over 10+ years working in the wine industry, specializing in wine membership programs, Kayla was the perfect addition to our membership team in July of 2021.  Her attention to detail is pivotal to ensure all members receive the highest level of attention and customer service at all times.  Kayla enjoys cooking and discovering new food and wine pairings.  Her favorite wine to pair food with is the Shadybrook Estate Platine Blanc – Semillon.

Winemaking and Production

Rudy Zuidema


Rudy’s passion and focus on making wine for premium estate programs has never been more evident than in his role with Shadybrook Estate.  In the vineyard, he follows organic and biodynamic farming practices that naturally enhance the flavor diversity demonstrated by the vineyard’s rich tapestry of individual blocks.  Rudy’s natural approach continues in the winery where he emphasizes classic, small-lot techniques and gentle handling to craft balanced wines that embody a sense of place with elegance, purity and power.

Having almost 30 years of winemaking experience in the Napa Valley, Rudy has worked with some of the most esteemed vineyards and wineries.  While looking for someone to evaluate their new estate vineyards by vinifying small lots from the 2010 harvest, Alice and David Alkosser invited Rudy to participate in their new venture. Upon viewing the vineyards and sampling the grapes, Rudy agreed without hesitation to be the winemaker for Shadybrook Estate. 

Francisco Vega

Associate Winemaker

Francisco was born to be in winemaking.  Growing up in the vineyards with his father, he has been around wine his whole life. He first met Rudy, our winemaker, when he was just a teen working in a fellow Napa winery cellar with his dad.  Discovering his love for the craft at a young age, Francisco decided to make it his career.  He traveled to New Zealand for several harvest internships to gain additional hands-on winemaking knowledge.  Upon returning to Napa, he worked as a Vineyard Supervisor, allowing him to build a strong foundation in viticulture.  He has now worked for Rudy for 10+ years, playing a crucial role in the Shadybrook Estate cellar for the last 6 years.  Outside of work, Francisco enjoys spending time with his wife, 6 mo. old son, and German shepherd.

Vineyard Management and Farming

Tom Prentice


As Shadybrook Estate’s viticulturist, Tom Prentice brings with him more than 40 years experience as an advisor in the overall management of the vines.  His technical services of agricultural land spans over 100,000 acres and countless crops throughout the US and abroad.  However, Tom’s true love is in the vineyard and his expertise has proven indispensable in all stages of the Shadybrook Estate’s vineyard care and planting programs. 

Mario Bazan

Consulting Vineyard Manager

Beginning in the early 1970’s, Mario has farmed thousands of acres for some of the most prestigious wineries in Napa Valley.  Mario has consistently demonstrated a committed effort and expertise in his crucial role of ensuring that the best sustainable practices are followed for the proper care of the vineyard.  He has been associated with the Shadybrook Estate vineyard for over 20 years and has a special knowledge of our hillside Coombsville fruit.

Fermin Hernandez

Ranch Manager

Fermin was the very first employee hired by Alice and David when they purchased the Shadybrook Estate vineyard in 2009.  Fermin’s care for the property and vineyard was instantly noticed.  Fermin now tends to all five vineyard properties as our Ranch Manager.  His passion and day to day care of the vines can be felt in every glass of Shadybrook Estate wine that is enjoyed.