Tom Clark attended Penn State University, receiving a B.S. Degree in Landscape Architecture in 1971. He joined the Maryland-based firm of Edmund B. Ault, Ltd. that same year. Over the next three-dozen years, Clark had primary responsibility on design projects along the Eastern Seaboard, Southeast, and Midwest. In 1984, Clark became a full partner with Edmund and Brian Ault in the reorganized company called Ault, Clark & Associates, Ltd.