Pittsburgh school board member Heather Arnet is resigning Tuesday.

Ms. Arnet made the announcement today in a letter to school board President Theresa Colaizzi.

Ms. Arnet, who joined the board in December 2007, is executive director of the Women and Girls Foundation of Southwest Pennsylvania. She said the economic downturn has affected the foundation's revenue and is requiring her to devote more time to her job.

Mayor Luke Ravenstahl will appoint Ms. Arnet's replacement, and that person will serve until December 2011, Ms. Colaizzi said. Ms. Arnet is the District 2 board member representing various East End neighborhoods.