I know that this might cause a lot of flaming, but I really want to know. Engineering is a branch of application in Science. So my question is, if a person has a Ph.D in Chemistry, Physics, Mathematics, and Biology, would he or she be able to do a job normally needed for a Engineer that requires a Ph.D? Or can someone with a Ph.D in Physics and Mathematics would be able to do an Engineer's job? If not, why? If being a wielder of a Ph.D, doesn't that mean he or she should know everything in that field? And since Engineering is part of that, should he or she be able to do that job without the need for the degree?