Geophysical Survey Systems Inc. (GSSI) announced Brett Caldwell has joined the team in the position of technical applications specialist supporting the geophysical, geotechnical, environmental and academic markets. After serving in the U.S. Army’s 10th Mountain Division Core Air Defense Element as an assistant operations sergeant, Caldwell worked in a variety of customer-facing positions, including sales, coaching, and management positions in the automotive and athletic apparel industries. Caldwell then studied geology at Towson University before beginning his work for Penhall Technologies, first as a ground-penetrating radar analyst and then as a field supervisor, in which he managed all aspects of GPR activities for Penhall Technologies in the central U.S. region.