Top 15 MLB Hothead Managers by Ejection Frequency

We've published the Top 10 MLB Hothead Players by Ejection Frequency, so now it's time to list the Top 15 Hothead Managers in Major League Baseball. Once again, the umpire sabermetric value Games Per Ejection (GPE) will be used to determine the most frequently ejected skippers in the game.

As we used David Ortiz's 175 GPE for the players' benchmark, we will use all-time managerial ejections leader Bobby Cox's mark of 161 ejections over 4,501 regular season + 136 postseason games, or 29 GPE as our basis for illustration.

Perhaps, however, the more apropos comparison for Cox's notably incessant managerial GPE of 29 is Milton Bradley's GPE of one ejection for every 55 games played.
Related Post: Determining The League's Biggest Hothead (It's Big Papi) (6/11/15).

Rick Renteria is the most-frequent skip ejectee.

Here are the results for the ten most-frequently ejected active managers (minimum 300 games managed). Because managing a team is very different from playing on one, we'll only include data from a person's time as a bona fide manager of a major league ball club. You can also click each skipper's name that appears in the accompanying table for that individual's UEFL ejection report history.

Note that the language used—Hothead Manager—is meant as a consistent title in concert with our Hothead Players feature. Many times, however, a manager—such as Cox—would be ejected not because of a "hothead" reason, but in order to protect a player, who might instead be the true "hothead."

Legend and Definitions
Ejection Rate: Measured in Games-Per-Ejection (GPE).
GPE: Games played divided by their ejections.
EPS: Ejections per Season, based on 162 GP.

Active MLB Managers with Highest Ejection Frequency

#	Player Name	Games Per Ejection (GPE [GP/EJ])	Ejections Per Season (EPS [E/GP*162])
1	Rick Renteria	27	6.05
2	Ron Gardenhire	29	5.53
3	Joe Maddon	40	4.05
4	Brad Ausmus	40	4.02
5	Clint Hurdle	41	3.96
6	Don Mattingly	45	3.63
7	Brian Snitker	50	3.25
8	Craig Counsell	52	3.18
9	Bruce Bochy	52	3.10
10	Andy Green	54	3.00
11	Ned Yost	55	2.92
12	Bob Melvin	56	2.89
13	AJ Hinch	57	2.83
14	Bud Black	58	2.79
15	Terry Francona	69	2.35
15	Scott Servais	69	2.33

To summarize:
> Alex Cora (81 GPE and 1.00 EPS), Aaron Boone (54 GPE and 1.50 EPS), and Mike Shildt (35 GPE and 4.70 EPS) didn't make the table because they had too few games of managerial experience.
> Joe Torre (65 GPE and 2.49 EPS), Joe Girardi (48 GPE and 3.37 EPS), and John Gibbons (30 GPE and 5.32 EPS) didn't make the table because they are no longer active managers.