A mechanic
When simple machines work together, that forms a compound machine.
Builder
The use of machines is called operating machinery. You are using it for whatever porpose so therefore you are operating it. Whether it be operating heavy equipment down to using a computer.
A compound machine.
I think its called operating i am not sure but type this question you asked into google.com and it will probably pop up. I hope I helped answer your question throughly.
machinist
they are called optomistic
a mecanical engineer.
A person who looks for ancient stuff could be known as an antiquarian.
A FREAK
zookeeper
zookeeper
A person who plans machines is called an engineer. People who make them can have a number of titles including mechanic and millwright.
This person is called a "groom".
in India he is called Mahut
shepherd
a forrester