Are all of these sentences correct:
1) As an engineer, John had to make all the important decisions.
2) As he was an engineer, John had to make all the important decisions.
3) As someone who wasn't in the country when the robbery took place, there seemed no need to interrogate Harry.
4) As he was someone who wasn't in the country when the robbery took place, there seemed no need to interrogate Harry.
Gratefully,
Navi