Who is Sy Greene from My Soul to Keep and what is their importance?

Sy Greene is Jessica's immediate news editor at the Miami Sun-News. He is prepping her for a chance at a Pulitzer with her writing. For this reason, he picks her articles apart during the editing process. It is Sy who calls Jessica to let her know about Peter's murder. It is also in Sy's office that Lieutenant Reyes questions Jessica about David's encounter with Peter the night of Peter's murder. Like Jessica, Sy believes that Reyes is interrogating her.