Spain runs Mark Spain Real Estate, an Alpharetta, Georgia-based brokerage with nearly 450 agents who do over $3 billion in annual sales. Before establishing his firm in 2016, this second-generation agent ran a team affiliated with Keller Williams Realty. In 2025, Spain hired a CEO and president to run his brokerage’s day-to-day operations as he transitioned into a role focused more on long-term vision, innovation and strategic guidance.