Donald Westlake AKA Richard Stark is the author of several book series that follows thieves. From the hard-nosed, no holds barred world of Parker, to the more lighthearted comedic crimes of Dortmunder and his gang, if you enjoy a good caper you'll be sure to find something you love.
http://www.donaldwestlake.com/

Andrew Vachss' series follows Burk who lives in the New York underground and operates in a world not seen by normal citizens. A look at the darker side of humanity, Burk is a character that is unforgiving and yet relatable.
http://www.vachss.com/

Joe R Lansdale writes the Hap and Leonard series of two life long friends and the adventures they wind up on. Colorful and often times crass. Hap and Leonard are great entertainment.
http://www.joerlansdale.com