Experienced folks: WHO researches your title? (I need help from all 50 states)

[Brandon Turner]

Here in Washington State, I go to a Title Company after signing a contract with a seller and the title company researches the chain of title and issues title insurance, and then the Title Company will actually close the transaction. 

So my question is: 

WHAT state are you in?

WHO researches the title in your state? (title company, escrow, lender, attorney, etc?)

WHO closes the transaction? (title company, escrow, lender, attorney, etc?)

Thanks for your help! (this is for an upcoming book from BiggerPockets!)