Robert L. Forward
Robert Forward wrote numerous papers on space travel, including many novel solar sail designs and applications. These have included, but are not limited to, microwave sails, designs for flyby, one way, and two way laser driven solar sails, the solar photon thruster, and sail levitated orbits. Robert Forward was most recently a partner and chief scientist of Tethers Unlimited. He passed away on September 21st, 2002.