Appointment of Crew Chiefs
Each year the Office of the Commissioner shall appoint an umpire to act as the Crew Chief for each of the crews formed for the championship season. While the Office of the Commissioner may consider seniority along with other factors that it may deem appropriate when exercising its appointment discretion, seniority shall not control in the Office of the Commissioner's choice of Crew Chiefs.

The Crew Chief shall coordinate and direct his crew's compliance with the Office of the Commissioner's rules and policies. Other Crew Chief responsibilities include: leading periodic discussions and reviews of situations, plays and rules with his crew; generally directing the work of the other umpires on the crew, with particular emphasis on uniformity in dealing with unique situations; assigning responsibilities for maintaining time limits during the game; ensuring the timely filing of all required crew reports for incidents such as ejections, brawls and protested games; and reporting to the Office of Commissioner any irregularity in field conditions at any ballpark.

Below are the crews for the 2006 championship season. Crew Chiefs are noted with the letters (cc) after their name.

Crew A Marsh, Randy - cc Hernandez, Angel Wendelstedt, Hunter Holbrook, Sam Crew B Young, Larry - cc Hohn, Bill Everitt, Mike Marquez, Alfonso Crew C Reilly, Mike - cc Kellogg, Jeff Meals, Jerry Fletcher, Andy Crew D Reliford, Charlie - cc Vanover, Larry Gibson, Greg Nauert, Paul Crew E Welke, Tim - cc Cederstrom, Gary Danley, Kerwin Reynolds, Jim Crew F Darling, Gary - cc Poncino, Larry Dreckman, Bruce DiMuro, Mike

Crew G DeMuth, Dana - cc Joyce, Jim Schrieber, Paul Eddings, Doug Crew H Montague, Ed - cc Layne, Jerry Wegner, Mark Hudson, Marvin Crew I Reed, Rick - cc Tschida, Tim Barrett, Ted Diaz, Lazaro Crew J Froemming, Bruce - cc Winters, Mike Runge, Brian Emmel, Paul Crew K Brinkman, Joe - cc Cousins, Derryl Nelson, Jeff Timmons, Tim Crew L Crawford, Jerry - cc Meriwether, Chuck O'Nora, Brian Cuzzi, Phil

Crew M Davis, Gerry - cc Gorman, Brian Cooper, Eric Miller, Bill Crew N McClelland, Tim - cc Culbreth, Fieldin Foster, Marty Welke, Bill Crew O Hirschbeck, John - cc Bell, Wally Bucknor, CB Carlson, Mark Crew P West, Joe - cc Rapuano, Ed Randazzo, Tony Wolf, Jim Crew Q Scott, Dale - cc Kulpa, Ron Iassogna, Dan Barksdale, Lance