Honestly, who cares? I come from a family of doctors, both Ph.D.s and M.D.'s. Outside of professional or academic capacities, no one cares. Back to the original question, "Ph.D." is correct. Violinist, I hold a Ph.D. in a very technical field. However, if you think, for one moment, that King Lear is easy to understand, then I'd have to conclude that you really are intellectually shallow.