Experimental investigations on the three stellarators at the University of Wisconsin are summarized. Heating experiments on the Proto-Cleo stellarator included Alfvén wave heating, ion cyclotron heating and inductive heating. The plasma injection process was also investigated and measurements of Pfirsch-Schlüter and bootstrap currents were performed. Measurements on the Proto-Cleo torsatron focused on fluctuation studies, confinement characteristics and on examination of the runaway instability. On the newest device, the interchangeable modular stellarator, studies have concentrated on magnetic-surface mapping, modular divertors and electron cyclotron heating.