Internationally, he is best known for his contributions to anti-windup control - algorithms which augment standard control systems so that they retain stability and functionality in the presence of input constaints (ubiquitous in control systems). His ideas on anti-windup have been applied to various practical control systems and, together with DLR Braunschweig, he was part of several flight test campaigns examining the efficacy of anti-windup compensators for the alleviation of pilot-induced-oscillations (PIO's) in highly augmented aircraft.