Philip K. Dick is one of the most influential names in science fiction. If you're unfamiliar with his name, it is unlikely that you are unfamiliar with his work. His stories have been made into major motion pictures like Blade Runner, Total Recall, Screamers, Paycheck, and Minority Report.
Check IMDb for a more extensive list.
I highly recommend that you read him. There are several collections available in print, and since many of his stories are very short, they are ideal for those times you're sitting on a bus or waiting in a doctor's office.
...and remember to check out and "like" my Facebook page for more graphics like this, and for various articles and news stories from around the web. I tend to focus on issues concerning the way that we perceive the universe as well as the way that the media shapes social realities. or something like that. Check it out!