[2] According to its mission statement, MPI is a "nonprofit, nonpartisan organization that conducts detailed and timely research to educate the public, the media, and lawmakers about public policy solutions that advance economic freedom and individual liberty in Maine.

Pierce, Debra Plowman, Laurence Rubinstein, Amy Volk, James Ward, and director emeritus Neal Freeman.

[4] In 2006, MPI was prominently involved in the unsuccessful campaign for the Taxpayer Bill of Rights (TABOR) in Maine.

[5] In August 2011, MPI and the Maine chapter of Americans for Prosperity distributed a videotape produced by conservative activist James O'Keefe which "hint[ed] at" Medicaid fraud.

[6][7] MPI has been involved in policy debates over issues such as government spending, welfare reform, and Maine's pension debt.