Living in the Silicon Valley means that I’m around a lot of scientists and engineers. But what exactly is the difference between a scientist and an engineer? The difference is that scientists are more interested in the theory behind something, and engineers prefer to actually build it. You could say that scientists like to learn new concepts while engineers like to apply them.
Artists are obviously different from scientists and engineers. Professionals, on the other hand, may not be so obvious. Professionals are educators who share knowledge, instead of dedicating their time to gathering or applying it.