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cyberwulf, thanks for your comments. In addition to the movtivation for switching fields, could you comment how my background will affect my application and what levels of programs I should shoot from your perspective?

I am thinking about applying for a PhD biostat/stat program in the US. I got both my bachelor and PhD degrees in Physics from one of the top universities in China, and now am working in computational biophysics/biology in the US. Here is my background. Undergraduate (physics) GPA: 3.65 Graduate (computational physics, MS) GPA: 3.9 Graduate (computational physics, PhD) GPA: 4.0 Graduate (computational physics,MS+PhD) GPA: 4.0 A number of publications in computational physics and bio-related fields. My question is whether my PhD background will be a plus or minus to my application. Will the programs consider someone like me who already have a PhD and quite a research background? If yes, what should I pay attention to and do in my application? and which ranking of universities should I shoot for my application? Thank you very much for your help!