The Splinter Group as a company is a group of Napa Valley winemakers who have teamed up to finish classic American Whiskies in ex-Wine casks. The Sinter Group was founded in 2013 by John Wilkinson of winemaker Bin to Bottle and Dave Phinney of Orin Swift Wines.

They have since been joined by other experienced oenophiles (wine lovers) in the area, representing decades of experience. As non-distilling producers, they source their aged Whiskies from established producers across the midwest and southeastern United States and then blend them on site in northern California. The married spirits are finally finished in first-fill Wine casks.

They have completed four products to date, including an American Whiskey, Bourbon, Rye, and a Sweet Vermouth. If the legal rules and regulations were a bit different, Slaughter House American Whiskey might be called a Bourbon. The mash bill is 85% corn, 8% wheat, 6% rye, and 1% malted barley and the spirit has been aged nine years in “American Oak” before being finished in Napa Valley Bordeaux Wine casks.