Chris Schaeffer

I met him at an extended spring training game at Paul Owens Training Facility at Carpenter Complex in Clearwater, Florida in 2019, when the Toronto Blue Jays, whom he was a position coach for, came to play the Philadelphia Phillies.

Chris signed a 2011 Vancouver Canadians Team Set card.

https://www.baseball-reference.com/register/player.fcgi?id=schaef002chr

Don Wakamatsu

I met him at the Pro Ball Baseball Clinic at Pirate City in Bradenton, Florida in 2017.

Don signed a 1990 CMC card #649.

https://www.baseball-reference.com/players/w/wakamdo01.shtml

Doug Mansolino

I met him at a Minor League GCL Phillies game, whom he was the Phillies Minor League field instructor for, at Paul Owens Training Facility at Carpenter Complex in Clearwater, Florida in 2016.

Doug signed a 1989 ProCards card #575.

http://www.baseball-reference.com/register/player.cgi?id=mansol001dou