In brief.(News)(Aon Corp. appointing Lester B. Knight as nonexecutive chairman)(House Energy and Commerce Committee approving legislation allowing seriously ill college students to continue coverage under their parents' health insurance)(Pension Benefit Guaranty Corp to lose up to one-quarter of its staff within the next four years due to retirements)

Aon names chairman to succeed Ryan

Aon Corp. said that Lester B. Knight will become nonexecutive chairman Aug. 1, succeeding Aon founder Patrick G. Ryan, who will retire on that date. Mr. Knight, who has been an independent director at Aon since 1999, is a founding partner of private equity firm RoundTable Health Partners. He previously vice chairman of Cardinal Health Inc. and former chairman and chief executive officer of Allegiance Corp. Mr. Ryan announced his retirement in April, explaining that the transition under President and CEO Gregory Case begun in 2005 was "complete.''

Panel OKs ill student cover extension bill

Legislation approved by the House Energy and Commerce Committee …