His research and teaching interests focus on successfully managing employees. He has 15 published peer reviewed articles that focus on expatriates, ethical leadership and human resources. At JMU Marshall is the College of Business Civic Engagement Fellow, a member of the Civic Engagement Team, and is the advisor to the JMU College Republicans. He is serving as an Augusta County Board of Supervisor (R) since 2012, and is the treasurer for the Central Shenandoah Planning District Commission. Marshall obtained is undergraduate degree at Texas Christian University, an MBA at George Washington University and his Ph.D. at University of Texas at Arlington. Marshall also has experience as a business process risk consultant and work as a human capital consultant.