George McCaskey officially accepted the chairmanship of the Bears' board of directors today at Halas Hall, the team's website reported.
The club announced in April 2010 that George would replace his older brother Michael and the transition has been in the works since then.
"It's humbling and exciting," George told the team's website. "All that my brothers and sisters are asking of me is everything that I've got, and I'm sure Bears fans expect nothing less than everything that I've got, and that's what I intend to give."
George headed the team's ticket office since 1991.
George has met with Dallas Cowboys owner Jerry Jones, New Orleans Saints owner Tom Benson, and he's scheduled to visit with New York Giants owner John Mara before the season.