The New York Mets current PA announcer is Alex Anthony. Called the "Voice of the Mets", Anthony has been with the Mets since 2004 and moved with them to Citi Field in 2009. If what you were looking for was broadcasters then this is the list of the important ones:
Ralph Kiner (Radio 1962-1981) (TV 1962-present)
Gary Cohen (Radio 1989-2005) (TV 2006-present)
Lindsey Nelson (Radio/TV 1962-1978)
Bob Murphy (TV 1962-1981) (Radio 1962-2003)
The original TV/Radio team of Kiner, Murphy, and Nelson were together from 1962-1978, which at the time was the longest lasting broadcasting tim in history.
Claude Mouton was the PA at Parc Jarry from 1969-1973. He was also the PA for the Montreal Canadiens. Mouton was the gentleman that would announce "le receveur, the catcher, John BOCCCCCCCCCCABELLLLLLLLLLLAAAA!" whenever John Boccabella came to bat.
Montreal Expos ended in 2004.
Montreal Expos was created in 1969.
In 2004, the Montreal Expos had a 67-95 record.
In 1990, the Montreal Expos had an 85-77 record.
In 1991, the Montreal Expos had a 71-90 record.
In 1992, the Montreal Expos had a 87-75 record.
In 1993, the Montreal Expos had a 94-68 record.
In 1995, the Montreal Expos had a 66-78 record.
In 1996, the Montreal Expos had an 88-74 record.
In 1997, the Montreal Expos had a 78-84 record.
In 1998, the Montreal Expos had a 65-97 record.