He took the doctorate degree in Europe. He gained a PhD in Physics. "Doctor of Philosophy" (PhD): a doctorate in just about any subject except law or medicine.

He took the doctorate degree in Europe. He gained a PhD in Physics. "Doctor of Philosophy" (PhD): a doctorate in just about any subject except law or medicine. "Doctor of Letters" (D.Lit.): a doctorate in Law. "Doctor of Medicine" (D.Med.): a doctorate in medicine.