Sir Donald Tsang will replace Anson Chan, who stepped down abruptly last month 18 months before the end of her term.
Dr. Keizs, 60, who was York's acting president in 1996, succeeds Robert L. Hampton, who stepped down abruptly last month.
The original chairman of the Sept. 11 commission, Henry A. Kissinger, stepped down abruptly because he said resolving potential conflicts of interest would have meant liquidating his consulting firm, while his vice chairman, former Senator George J. Mitchell, stepped aside in part because of an unwillingness to sever ties with his law firm.
That path that was disrupted when the CEO who hired her stepped down abruptly after having an affair, and was replaced by the previous CEO who went back to Priceline's older, federated strategy.
But their willingness to step down without complaint changed abruptly when Paul J. McNulty, the deputy attorney general, said at a Senate hearing earlier this month that most of the dismissals were carried out to correct performance problems, according to associates of several prosecutors.
In March, the social radio company saw its long-time CEO Joe Kennedy abruptly step down, leaving the board to scramble to find a replacement.
The overseer of the most expensive public works project under way in America, Boston's "Big Dig," was abruptly asked to step down today after federal auditors denounced him for staying deceptively mum for months about $1.4 billion in looming cost overruns.
Last October, at the progressive think tank with close ties to the Obama administration, co-founder and former Bill Clinton chief of staff John Podesta abruptly announced he would step down.
Last week, after enduring months of fierce criticism, Mr. Ospel abruptly announced that he would step down as chairman later this month.
David Westin, the president of ABC News, abruptly announced yesterday that he will step down at the end of the year.
