(207) 318 1004

Mark N. Dion, Esq.

Mark established Dion Law LLC in 2013 after three years with another Portland law firm. His practice areas include criminal defense and family law matters. He also has particular interests in legal issues involving mental health treatment as well as policies involving medical marijuana.


Mark’s career began with his appointment to the Portland Police Department, where he retired as Deputy Chief of Police after twenty-one years of public service. He subsequently served twelve years as the elected Sheriff of Cumberland County.


Mark is well versed in police administrative, investigative and operational practices. He has also developed a recognized expertise in jail management and has been certified as a correctional executive by the American Correctional Association.


Mark has received numerous awards for his work in civil rights from the NAACP, the Maine Gay and Lesbian Alliance, the Jewish Federation of Southern Maine, and the Maine Holocaust and Human Rights Center. He has also been honored with a commendation from President William Jefferson Clinton for his leadership in community policing. In addition he has received national recognition for his work in diversity advocacy by the International Association of Chiefs of Police and Parade Magazine.


He has previously served as an adjunct faculty member at Southern Maine Community College and now teaches criminal justice courses at Husson University.


Bar Admissions:

• Maine, 2006


• University of Maine School of Law (JD 2005)

• Harvard University, JFK School of Government (Senior Executives Program in State and Local Government 1997 )

• Antioch New England Graduate School ( Master in Human Services Administration 1994 )

• University of Southern Maine (BA/ Criminal Justice 1983)


Professional Associations:

• Maine State Bar Association

• Cumberland County Bar Association

• Maine Association of Criminal Defense Lawyers

• Maine Sheriffs Association

• Maine Chiefs of Police Association

• FBI Law Enforcement Executive Development Association


Legislative Service

• Maine House of Representatives, 125th, and 126th Sessions (2010-2014)

• Former Member of the Joint Standing Committee on Energy, Technology and Utilities

• House Chairman of the Joint Standing Committee on Criminal Justice and Public Safety


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