Photography and Linux

Is it possible for a professional photographer to use a FOSS-based workflow? I'm a professional photographer based out of Miami, Florida. I learned photography on my own, starting at age 12, with a Yashica TL Electro 35mm film SLR. In college, I discovered I also had quite an affinity for computers and programming, so I got my degrees in that field. I landed an IT job in county government, and photography took a back seat in my life until two things happened: I became a father, and the digital revolution came to the world of photography.