[2] Marzilli was educated in the Arlington Public Schools and received a bachelor's degree in political science from the University of Massachusetts Amherst.

[3] He is an international relief worker with experience in Iraq during the US occupation in 2008, Burma/Myanmar training students and activists in democratic governance and public finance, and reforestation projects in Guatemala [4] Previously, Marzilli was a member of the state legislature in Massachusetts.

[5] Marzilli wrote the law that expanded the earned income tax credit benefiting low wage workers.

His Clean Car Initiative would create a sliding scale sales tax based on a vehicle's fuel efficiency.

He has spoken on energy and environmental policy, and climate change in Canada, Mexico, Argentina, Brazil, Germany, England, Italy, India and China.

[3] In October 2008, Marzilli was the highest-ranking American official to attend an international conference on global warming sponsored by the Institute for Ecological Economy Research in Berlin, Germany.

[17] On July 1, the Massachusetts State Senate voted 38–0 to refer the Marzilli's alleged misconduct to the Committee on Ethics and Rules, which will not release its findings until after his court cases are resolved.

[21] On June 9, 2010, the Massachusetts Supreme Judicial Court ruled that Marzilli could be prosecuted for "attempted indecent assault and battery".

[22] On February 22, 2011, Marzilli pleaded guilty to all charges against him, including resisting arrest and disorderly conduct, in Middlesex Superior Court and was sentenced to three months in prison.

[24] On August 5, 2008, his wife, Susan Shaer, mailed a letter to supporters explaining that he had been diagnosed as suffering from bipolar disorder and the recent events in Marzilli's life had taken place during a period of hypomania.