By Jeff Bennett 

General Motors Co. announced the departure of two senior leaders Monday as Chief Executive Mary Barra posted another blog saying executives will be held accountable in the company's ignition-switch recall.

John Quattrone replaces Melissa Howell as senior vice president global human resources. Ms. Howell, said the company, is leaving GM to pursue other interests. GM also announced the departure of Selim Bingol, senior vice president of global communications and public policy. Mr. Bingol is also leaving the company to pursue other interests.

The moves, say company insiders, are part of Ms. Barra's plans to revamp her leadership team since taking over the chief executive position in January. However, the announcement comes less than a week after GM said it was placing two engineers on paid leave due to their roles connected to the delay in issuing a recall for faulty ignition switches. It took the company nearly a decade to initiate a recall despite discovering the problem in 2004. A total of 13 deaths have been linked to crashes involving the faulty switches which can slip into the "accessory" position from "run," shutting power off to the air bags.

Separately, Ms. Barra took to the corporate blog yet again to communicate with employees and customers.

"Importantly, we promise accountability from our senior leadership back to these employees that we will take action or close each issue in a timely fashion," Ms. Barra said in her blog posting. "We will learn from our recent experience, and it will make us better."

Last week, Ray DeGiorgio and Gary Altman, were placed on paid leave following a briefing from Chicago attorney Anton Valukas who is overseeing an independent investigation into circumstances leading to the recall.

"This is an interim step as we seek the truth about what happened," Ms. Barra said in a statement. "It was a difficult decision, but I believe it is best for GM."

Ms. Howell joined GM in 1990 and was named senior vice president of global human resources in February 2013.

Mr. Quattrone is a native of Syracuse, N.Y., and began at GM in 1975. He has held various positions in human resources and labor relations an appointed GM North America's vice president of human resources in 2001.

Mr. Bingol joined GM in 2010 as senior vice president global communications. He took on the additional role of global public policy in October 2012.

A replacement has yet to be named.

Write to Jeff Bennett at jeff.bennett@wsj.com

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