The Seattle Times · Jan 21, 2020
Mariners announce player development and affiliate coaching staffs for 2020 season
With spring training less than a month away, the Mariners have finalized their player development staff for the 2020 season.
General manager Jerry Dipoto and Andy McKay, Seattle’s director of player development, announced the coordinating staff as well as the coaching staff for each of the club’s seven affiliates, Tuesday.
The most notable internal promotion was given to Tony Arnerich, who will move from catching coordinator to minor league field coordinator. Arnerich, who will be entering his fourth season in the organization, fills the opening created when Carson Vitale was promoted to the Major League coaching staff.