Margaret Boles Fitzgerald was appointed to Brookline Bancorp Inc.’s board of directors on Friday, following the board’s decision to increase its size to 13 members. She will also serve on the board of directors of Brookline Bank.

Fitzgerald is director of corporate and foundation relations at Boston Health Care for the Homeless Program and chairs the board of The Henry Luce Foundation. Previously, she was as an executive vice president and director of community relations at Hill Holiday advertising in Boston.

Fitzgerald works with local nonprofit organizations including The Museum of Fine Arts Boston, The Salvation Army of Massachusetts Bay and the Roy T. Morgan Foundation in Rhode Island.

"Margaret is an important addition to our board as she has a great deal of experience in the community, both locally and regionally," Paul Perrault, CEO and president of Brookline Bancorp, said in a statement. "I have no doubt that she will serve the Board well and provide us with an additional, strong link to the communities we serve."