Flandry of Terra
Frank Kelly Freas had a style that nearly bordered on caricature. Yet his cover visions of Galactic Empires were always my favorite, never failing to put me in the mood to read the book. Of course it helped that Poul Anderson was pretty good at evoking Galactic Empires with word pictures. Flandry of Terra zoomed between stars in just hours, a necessary achievement if an empire consists of thousands of stars.