BOSTON (CBS/AP) — Gov. Deval Patrick has chosen MBTA General Manager Richard Davey to be the state’s next secretary of transportation.

It was announced at an afternoon news conference at the State House.

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The 38-year-old Davey would take over as secretary on Sept. 1.

He has held the top spot in the Massachusetts Bay Transportation Authority’s top position since March 2010.

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Davey would succeed Jeffrey Mullan, who has said he will leave the $150,000-a-year job later in the year.

Mullan was criticized earlier this year after the collapse of a Big Dig lighting fixture was not publicly disclosed for months.

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