Andrea Pion of The Davis Companies has been elected executive chairman of the Marlborough Economic Development Corp., the organization has announced.

Ms. Pion, who is vice president of national client programs at Marlboro-based The Davis Companies, has served on the MEDC board since 2016.

She succeeds Richard Tomanek, general manager of Embassy Suites – Marlboro, who has served as MEDC’s executive chairman since 2014. He will remain a member of MEDC and continue to serve on its board and executive committee.