Mark McWilliams, born and raised in Texarkana, Texas, is the son of Al and Janis McWilliams. He has been involved in Arista winery and vineyard operations of Sonoma County for the past 10 years.

After graduating from the University of Texas - Austin with a degree in Corporate Communications, Mark took his first job out of college working for Kendall Jackson Wine Estates. What started as a temporary summer job developed into a passion as Mark enrolled in UC Davis Wine and Viticulture courses, tasting groups, and annoyed his winemaker friends with endless questions. During his time with Kendall Jackson, Mark held various positions encompassing vineyard operations, harvest logistics, and cellar work. Following his time at Kendall-Jackson, Mark continued his passion for wine and pursuit of industry knowledge by working as a wine consultant for a wine and spirits distributor based in Dallas, Texas.

In the fall of 2003 Mark married Jennifer Habecker, a native of Dallas. Shortly thereafter, Mark and Jennifer returned to Healdsburg, California to be fully involved with Arista. Mark manages the day to day operations at the winery. Mark and Jennifer live in Healdsburg, California with their sons Jake and Pierce and their daughters Macie and Maggie and their Maltese "Lucy".