[huxley]

Actually Elon isn't an engineer, he has Bachelor of Science degrees in Physics and Economics (Wharton) as well as 2 days worth of a PhD in Applied Physics and Materials Science (Stanford).

What I didn't know was that Jeff Bezos actually does have an engineering degree, a Bachelor of Science in Engineering (Princeton).

[sixQuarks]

You don't have to have a formal education to be considered an engineer. His bio says "engineer, inventor, explorer" http://www.biography.com/people/elon-musk-20837159

[yladiz]

I disagree, being an engineer is similar to being a doctor, meaning you go through training and take an oath before officially becoming one. I wouldn't consider a colleague an engineer if they didn't take the engineering oath.

[snovv_crash]

That's to be a registered engineer. It means you can sign off on human-used structures and machines. Lots of people are engineers, and just get a registered engineer to look it over and sign off before production.