He was an active jumping rider and sponsored international jumping rider Eric van der Vleuten for six years. During several years the firm he represented was the main sponsor of the World Cup Jumping. Before he became president of the KNHS he was vice-president of the well-known CSI/CDI ‘Indoor Brabant’ at ‘s-Hertogenbosch for ten years.
During his career Theo Ploegmakers was active as manager, director and vice-president of international operating firms. Nowadays he is DGA of the Gropeco Group B.V. at Vlijmen (NED).