Melvin was the NL Manager of the Year in 2007 with Arizona. He managed the Seattle Mariners from 2003-04 and then the Diamondbacks from 2005 until he was fired last May 8 and replaced by A.J. Hinch.
Wilson, a member of the Mets' 1986 World Series championship team, was their first-base coach from 1997-02 and a minor league manager for New York at Kingsport (2003-04) and Brooklyn (2005).
Guy Conti was replaced as rehabilitation pitching coordinator by Frank Fultz, and Conti becomes a senior adviser in the minor league department. Fultz was pitching coach for the Gulf Coast Mets last year.