Michael W. Laphen, chairman, president and chief executive at Falls Church-based CSC, has informed the technology giant that he plans to retire by Oct. 31, 2012, the company said Tuesday.

Laphen agreed to serve until a successor is selected and the transition to a new chief executive is complete, CSC said in a news release, noting that the company’s board has formed a search committee and hired an executive recruiting firm.

Laphen has been with CSC, which specializes in information technology for both the commercial and public sectors, since 1977. His past assignments at the company include leading CSC’s integrated systems division, its federal civil group and its European group. He was appointed president and chief operating officer in 2003 and assumed the chairman and chief executive roles in 2007.

Under his leadership, CSC in 2008 decided to relocate its corporate headquarters from El Segundo, Calif., to Falls Church.

Laphen’s announcement closely follows that of another local contracting executive. Walter P. Havenstein, chief executive at McLean-based Science Applications International Corp., will retire next summer, the company announced earlier this month. Havenstein, who has led SAIC for just over two years, said he would depart for personal reasons.

In a release, Laphen, 61, did not offer a reason for his departure.