Martha Hennessey was raised in Hanover and returned with her family in 2001, moving into the house she lived in as a child. Before returning to Hanover, she and her husband lived the Boston area, where Senator Hennessey was a school psychologist, psychotherapist, and a college professor. In New Hampshire, Martha is a Licensed Clinical Mental Health Counselor who consulted to schools and worked with children, adolescents, and parents in her private practice. As a developmental psychologist, Martha understands the changing needs of growing children and the critical roles of families and schools. 


In 2014, Martha was elected to the NH House of Representatives, representing Hanover and Lyme, and two years later she won a seat in the NH State Senate, representing District 5.

Senator Hennessey served on the House Children and Family Law Committee, followed by serving on the Senate Health & Human Services and Judiciary Committees. She currently sits on several commissions, including the Governor's Commission on Alcohol and Drug Abuse Prevention, Treatment, and Recovery. In 2017, Senator Hennessey introduced a bill establishing a commission to study the needs of families in which children are being raised by grandparents ("grandfamilies"), due to the opioid epidemic. She currently chairs the Commission to Study Grandfamilies, and is a member of the Children's Caucus and the Gun Violence Prevention Caucus in the legislature.

Martha met her husband, Steve Severson, at Dartmouth College. Together, they completed graduate degrees in Massachusetts and Pennsylvania, while beginning their family. When not in Concord, Martha enjoys skiing, traveling, and spending as much time as possible with their three (grown children), five granddaughters, and two small dogs, Teddy and Alice.


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