Harry Harrison was one of the greatest science fiction writers you've probably never heard of. He wrote a whole bunch of fantastic stories including the Stainless Steel Rat series and my favourite, "The Technicolor Time Machine" (go find it - you'll thank me later). He was particularly good at the science fiction short story.
If you fancy finding out more about his work there's a really good value pack of his stories available on Amazon. For less than a pound you get a whole bunch of content including two of his Deathworld stories.
Well worth seeking out.