Carly Fiorina has resigned as chairman and chief executive officer of HP, effective immediately, the company announced today.

Fiorina, who has been HP's CEO for the past six years, is to be replaced on an interim basis by HP's current chief financial officer, Robert P. Wayman, the company said in a statement. Wayman, who has been with HP for 36 years, will also continue to fill his role as CFO. HP has already begun its search for a new CEO, the Palo Alto, California company said.

HP also named Patricia Dunn as its non-executive chairman of the board. Dunn has been an HP director since 1998.

HP said it does not plan to make any additional structural changes or executive leadership changes for the time being.

The company statement indicated that Fiorina's departure stems from disagreements on company strategy.

"While I regret the board and I have differences about how to execute HP's strategy, I respect their decision," Fiorina is quoted as saying in the statement.

A call targeted at financial analysts is scheduled for 9 am EST today.

Last month it was reported that HP's board of directors was considering a plan that would redistribute some of Fiorina's day-to-day responsibilities to other HP executives, due in part to the board's displeasure with the company's uneven performance.

HP said it plans to report its first quarter financial results on Feb 16 and will hold its annual shareowner meeting in Chicago on March 16.

Fiorina was instrumental in setting up the HP/Apple deal under which HP was able to offer the iPod to its US customers.