I would google it. I'm sure there's an "American Society of Occupational Medicine" or something.
Similarities include that both specialties have little or no call once you are in practice/out of residency.
Occupational medicine you can work for a large corporation, etc. as a doctor on their staff. Also you could probably work for some larger physician practices that do worker's compensation claims, etc.
Preventive medicine is more like public health - generally concerned not w/individual patients but with groups of patients/people. It's more like health promotion and disease prevention.
Neither one has a high income vs. some other specialties, but I think the lifestyle is pretty good. Would think you could work for a gov't agency with preventive medicine residency as well.
I have seen a few help wanted ads for these, but there doesn't seem to be the demand that there is for primary care docs or hospitalists.
