In 1972 he also took over as chairman and chief executive.

Mr. Carpenter, 41, took over as chief executive and president last week.

In December 2004 he took over as chief executive.

Since he took over as chief executive last spring, the shares are down 27 percent.

By 1993 he took over everything as chief executive.

A few months later the board asked him to take over as chief executive.

Mr. Breuer, who took over as chief executive three years ago, knows he is under pressure.

He took over as chief executive in 1970.

He took over as chief executive in 1991, the third consecutive chemical engineer to fill the top job.

Thomas Foster took over as chief executive in 1977 when he was 27, after his older brother Paul died of a heart attack.