As manager As coach John Joseph Mizerock (/ˈmɪzərɒk/; born December 8, 1960) is an American former Major League Baseball backup catcher for the Houston Astros and the Atlanta Braves.

He allowed three passed balls in a game against the Cincinnati Reds on April 19 to not only lose the back-up catcher job, but to also get himself sent back down to the minors.

He was brought back up for a third time in mid-August, and remained on the major league roster through the end of the season.

He was with the Astros on and off throughout their division winning 1986 season, and was on their post-season roster, but did not make an appearance in the 1986 National League Championship Series against the New York Mets.

Mizerock batted .240 with eight home runs and 94 RBIs in three seasons with the Richmond Braves to earn a September call-up to Atlanta in 1989.

After leading the team to a 40-36 record, he was promoted to the Class A Rockford Royals in 1994, where he earned Midwest League Manager of the Year honors.

Mizerock was promoted from bullpen coach to interim manager of the Royals 23 games into the season when Tony Muser was fired.

[citation needed] He accepted a position to once again manage the high level Class A Wilmington Blue Rocks minor league team for the 2007 season.

[11] Mizerock moved to the Philadelphia Phillies organization in 2011 as hitting coach of their Florida State League affiliate, the Clearwater Threshers.