Marshall is a native of Fauquier County, and has been operating his family farm since 1985. He has been deeply involved in various community organizations, serving on the boards of Ducks Unlimited, Highland School, Fauquier Hospital, The Virginia Gold Cup Association, Northern Piedmont Community Foundation, and the PATH Foundation to name a few. He feels fortunate to have been associated with these organizations and to witness their evolvement over the last several decades. While on the board of the Mental Health Association, Marshall hopes to contribute to improving mental health for all. In addition to volunteering, Marshall has a verdant love of the outdoors and all that goes with it. He is married to his wife, Nancy, who is also from Fauquier. Together, they have two adult daughters, both married, and a grandson.