In addition to her professional achievements, Attorney Brennan previously dedicated much of her time to the community. She was a member of the Greater Hazleton Chamber of Commerce, where she served on the Women's Networking Committee, and the Abington Business & Professional Association in northern Lackawanna County.

She was a board member and past board chair of the Volunteer Center of Greater Hazleton, Inc.

She also served as a board member of the United Way of Greater Hazleton; the Helping Hands Society of Luzerne, Carbon and Schuylkill Counties; and the Hazleton Chapter of the Penn State Alumni Association, MMI Preparatory School in Freeland, PA; the Greater Hazleton Association of Realtors; and the Hazleton Area Landlords Organization, where she also served as its solicitor.

Her service to these organizations went beyond her board membership. She also participated as a volunteer in numerous nonprofit events throughout the year for all of these mentioned organizations, as well as many others.

Her service to the community was recognized in 2008 by the Volunteer Center of Greater Hazleton, which presented her with the GEMS Award - Going the Extra Mile in Service.