jon sebastiani: managing partner

Jon Sebastiani is a graduate of Santa Clara University with a Bachelor’s degree in Economics and holds a dual MBA from the Haas School of Business at UC Berkeley and Columbia University. His expertise in establishing and growing successful food brands has been cultivated through years of managing operations in previous positions, as managing partner of, President of the premier California winery destination Viansa Winery, and most recently leading the jerky renaissance as Founder of KRAVE Jerky. In 2016, following the acquisition of KRAVE Jerky by The Hershey Company, Sebastiani launched Sonoma Brands. Sonoma Brands is a one-of-a-kind consumer products incubator and venture fund, set to revitalize stagnant industry categories with innovation. Sonoma Brands has since invested in Dang Foods and has launched two brands under its incubator umbrella; ZÜPA NOMA and SmashMallow. For more information on Jon and Sonoma Brands, please visit


Creamer joined the Stompers during the 2014 season as the Director of Game Day Operations and Community Affairs before working three seasons for the Golden State Warriors in event and arena operations. He also gained Major League Baseball experience in the ticketing department for the Oakland Athletics before returning to the Stompers as Assistant General Manager in 2017. The former Bowling Green State University Sport Management Graduate currently resides in his hometown of Petaluma.  


KElsey minigan: Special assistant to the Managing Partner

As Consumer Relations Manager and Sonoma native, Kelsey truly defines and represents the Sonoma Stompers and Sonoma Brands as a community pillar. Excited to firmly establish her hometown as a hub of entrepreneurship, Kelsey manages every interaction as the first point of contact and plays a supporting, cross-functional role in the efforts of the Sonoma Brands team, and is the point person on all Stompers-related Managing Partner Jon Sebastiani.

Kelsey completed her BA in Environmental Studies at UCSB before heading back to the Bay to work for the San Francisco Giants in Luxury Sales & Client Relations. After the incredible 2014 season came to a close, Kelsey took a position with Yelp as an Account Executive in Sales. During her time there, she focused on helping over 3,000 small to medium sized businesses utilize Yelp as a tool to support growth – and will likewise support the Sonoma Brands portfolio.


HAYLEY M. SLYE: director of marketing

Hayley M. Slye is in her second season with the Sonoma Stompers. She oversees the team's media, marketing and graphic design.

A graduate of Cal State Fullerton, Slye served as the Editor-in-Chief and sports editor of her college newspaper. Her sportswriting work has won two California Newspaper Publisher Association awards and has been published in Baseball Prospectus, Sports Illustrated online and

Outside of baseball, you can find her doting on her Chihuahua mix, Cash. Follow her on Twitter here.




Trey dunia: pa announcer

Trey Dunia is entering his fourth season as PA Announcer for the Sonoma Stompers.  Dunia is a member of the National Association of Sports Public Address Announcers and is very well known in the Sonoma County sports scene.  In addition to calling games for our beloved Stompers, he is also the voice of the SRJC Bear Cubs, The North Bay Rattlers, Analy High School's Flying Tigers and the Redwood Pal Golden Bears.  When he's not announcing you can find him at the gym, training for the CrossFit Open.  

BEN Lindbergh

Ben Lindbergh is a Special Assistant to the General Manager and a baseball writer at Ben Simmon’s The Ringer.  In the past, he has been a contributor at Bloomberg Sports, Grantland, and, in addition to serving as Editor-In-Chief at Baseball Prospectus, and was a staff writer with Nate Silver's FiveThirtyEight. He co-authored "Extra Innings: More Baseball Between The Numbers," won the SABR Greg Spira Award for his research on pitch framing, and wrote "The Only Rule Is It Has To Work" with Sam Miller about the 2015 Sonoma Stompers season. You can purchase the book here.


Sam Miller is a Special Assistant to the General Manager and staff writer for ESPN. Formerly the Editor-n-Chief of Baseball Prospectus, Miller has also written for ESPN The Magazine and the Orange County Register. He's the former co-host of the “Effectively Wild” daily baseball podcast with Ben Lindbergh, who is also his co-author for “The Only Rule Is It Has To Work,” which is about Sam and Ben’s 2015 boots-on-the-ground experience in the Sonoma Stompers front office. It can be purchased here.