Meanwhile, Peter Christensen, in his own blogpost, defined the two as follows:
Hacker: Always trying new things, trying to stretch the limits of what's possible or what exists… Linus Torvalds is a great example of a hacker - he had two giant ideas that few thought were possible - writing a free operating system and doing it with a worldwide collection of volunteers. Once something is functional and successful, the hacker moves on to another hard problem, like a serial entrepreneur.
Engineer: All of the definitions of engineering that I've found were too complicated and missed the point, so I propose this: An engineer is someone who takes something that is known to be possible, and makes it fit within a given, limiting set of criteria. Some common criteria are:
Engineers can become hackers
within a fixed budget
meet a performance benchmark
exceed certain reliability requirements
make it aesthetically pleasing
must include a certain capacity
meet arbitrary regulations (accessibility, environmental, paying living wages, etc)
Note that this doesn't mean that an engineer is any less creative than a hacker. On the contrary, the constraints provided by the engineering problem can provoke more creative and original thinking than that of the original invention.
On the other hand, Kim Guldberg answered, "What is the difference between an engineer and a hacker?" in quora
For journalists and the general public a hacker is someone who breaks into computer systems stealing information and doing other malicious stuff.
For hackers the term seems to have expanded… Today being a hacker is more a question of mind set than just skill set. It's a curious individual, who has obvious talents and knowledge. He (and today sometimes also she) is somewhat geeky and obsessive in his interests, he is persistent and able to think out of the box. He is not bound by conventions and what is understood as possible or the right way of doing things and he has an open mind.
So the answer to your question must be. If an engineer has the above-mentioned mind set, he can be a hacker if he wishes and work hard at it.
With that beginning, tell us your definitions of hackers and engineers, and explain (if you can) how engineers can become hackers.