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A person who fixes the glass portion of windows is called a glazier.
A cobbler.
It is called 'floating' the horse's teeth.
What you call person who fixes light
If you mean 'What do you call someone who repairs books?' then I think the answer is a 'bookbinder'. Sources: 'Inkheart' by Cornelia Funke
The rider is called a jockey.
a chiminey sweep (cleans them) a repair man (fixes them) a contractor (builds them) A steeple jack.
Horologist
I think the most proper name would be glazier, which is someone who installs and repairs glass.
A Mechanic
A mechanic.