Governor Martin O'Malley appointed Larry Giammo, a former Rockville mayor and director of a national non-profit, to the state school board Tuesday.

Giammo fills a seat vacated by Ivan Walls, a Montgomery County doctor, who resigned a few months ago. 

The appointment means the 12-member state board will continue to be dominated by five members from the Prince George's and Montgomery county area of the state.

Two school board members are from Baltimore City, one is from Howard, and three are from the rural counties of Kent, Allegany and Calvert. 

The board, which decides education policy for the state, also has one student member each year.

Giammo is executive director of Green America, a national non-profit focused on establishing a green economy. He also served as CEO of Property Tax Pros, and was mayor of Rockville from 2001 to 2007.