Third, even if one changes fields post Ph.D award, it is generally common that he or she is considered academically trained enough to acquire the new subject knowledge without doing a second or third Ph.D. One professor I know originally did a Ph.D in Physics, but subsequently decided to change fields into social sciences, and published widely, all through independent study. A second Ph.D is not required in such cases. In other words, the OP is not trustworthy and I probably wouldn't call him Dr Animeshalddar