From SABR member Scott Lindholm at Beyond the Box Score on May 8, 2014:
There are items in baseball that merit scrutiny for which data isn’t easy to come by, at least not at traditional sites like Baseball-Reference.com or FanGraphs. I’ve always been interested in manager ejections but was never able to easily find data. On a whim, I did a Google search and saw the information had been right under my nose for quite some time — going to the Manager section of Retrosheet yielded pure gold. In addition to traditional wins and losses, information on manager ejections is included as well. After taking a couple of days to gather and process the data, I found some very interesting information. This first table shows ejections among current managers (all data through the end of the 2013 season):
Not listed are new managers(Detroit), (Cincinnati), Rick Renteria ( ), Ryne Sandberg (Philadelphia) and (Washington). In general, the more games, the more ejections, but note the difference between Ron Gardenhire and Bruce Bochy when Bochy has mananged over 1100 more games.
The records go back to around 1900, and this table shows the managers with the most ejections:
Read the full article here: http://www.beyondtheboxscore.com/2014/5/8/5683262/baseball-manager-ejections-mlb
Originally published: May 14, 2014. Last Updated: May 14, 2014.