Who is Sean Casey and is he on Instagram?

Sean Casey (@stcasey34) • Instagram photos and videos

Yankees hire new hitting coach, picking former All-Star with Aaron Boone ties

Sean Casey (@themayorsofficemlb) • Instagram photos and videos

Sean Casey (@stcasey34) • Instagram photos and videos

Newly hired Yankees hitting coach Sean Casey reportedly sensed “Tension” among Yankees hitters after having length talks with his new squad…

It's #Metallica Day at #ATTPark and Kirk Hammett is taking over Instagram! 1st stop: chat with MLB Network's Sean Casey. #Fade…

Sean Casey (@stcasey34) • Instagram photos and videos

Sean Casey Virginia Sports Hall of Fame

Sean Casey (@stcasey34) • Instagram photos and videos

Sean Casey (@seancaseymp) • Instagram photos and videos