Public Service Enterprise Group, a Newark, N.J.-based energy company with $13.3 billion in 2008 revenue, appointed board member Caroline Dorsa CFO and executive vice president. Dorsa, 50, will step down from the PSEG board. She replaces Thomas O'Flynn, who has left the company. Dorsa most recently served as senior vice president for global human health, strategy and integration at Merck & Co. Earlier, she was CFO at both Avaya and Gilead Sciences and spent more than 12 years as Merck's treasurer.

Dish Network, an $11.6 billion pay television provider in Englewood, Colo., appointed Robert Olson CFO and executive vice president. He succeeds Bernie Han, who becomes COO. Olson, 50, most recently served as CFO of Trane Commercial Systems, the largest operating division of American Standard. Previously, he was CFO of AT&T's consumer services division and later its business services division. Olson has also served in executive positions in finance, marketing operations and planning at American Airlines.

Lubrizol, a Wickliffe, Ohio-based specialty chemical company with $5 billion of 2008 revenue, promoted Brian A. Valentine to treasurer. He takes over the treasury responsibilities from Charles P. Cooley, who continues to serve as Lubrizol's CFO and senior vice president. Valentine, 40, joined the company in 1998, moved to the treasury department in 2002 and was named assistant treasurer in 2008. Before joining Lubrizol, Valentine worked in finance and audit positions at Allen Telecom and Coopers & Lybrand.

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