Margaret Downey was born into a multi-cultural family in Baton Rouge, Louisiana. Margaret grew up in a highly prejudiced southern society in the 1950s. She became concerned about discrimination and its effects at an early age and has devoted her life to ending all forms of it.

Reading the literary work of Thomas Paine and Robert G. Ingersoll enabled Margaret to develop a keen sense of revolutionary thought. She became an openly declared Atheist and activist in her twenties.

Free from the constraints of religious dogma and patriarchal systems, Margaret became involved with the feminist movement. Margaret fought for basic rights such as freedom of expression, freedom of choice, personal family leave for working parents, equal pay, and promotional opportunities for women.

Margaret was also involved in anti-smoking issues due to her concern about children's health. Twenty-five years ago, her activism for controversial issues nearly cost Margaret her job. The initiatives for which Margaret worked and sacrificed are still commonplace today. As a single mother, Margaret was willing to jeopardize her income to fight for equal rights and respect for women, freedom of choice, freedom of expression, and freedom from religious intrusion.

In 1980 Margaret became a business woman when she established her own interior design service. The independence of being the sole owner of a business enabled Margaret to become more involved in modern day issues. She is active in issues such as maintaining the Jeffersonian wall of church/state separation, freedom from religious intrusion, freedom of choice, and death with dignity.

Margaret founded the Freethought Society of Greater Philadelphia (FSGP) and the Anti-Discrimination Support Network (ADSN) in 1993. In 1994 Margaret founded the Thomas Paine Memorial Committee.

FSGP has taken a strong stand against prayers in public schools, and government sponsored invocations. Through her activism, she has assured the placement of Freethought literature in university and public libraries, and the avocation of rational thinking. Through city proclamations, Margaret has established "Freethought Week" and "Thomas Paine Day" in the City of Philadelphia, Pennsylvania. The City of Philadelphia also recognized "Privacy Week" thanks to a proclamation submitted by Margaret in March, 1997.

Margaret is editor and publisher of the bi-monthly newsletter published by FSGP. The Greater Philadelphia Story is a newsletter written by and for the Atheist community. As a free-lance journalist Margaret, pursues stories of discrimination, choice in dying, humanitarian lifestyles, and family planning. Her newsletter concentrates on activist issues, political and religious satire, separation of church and state, and the advancement of freethought.

The Thomas Paine Memorial Committee has established proper recognition for the memory of Thomas Paine in various Pennsylvania cities including Philadelphia, Lancaster, and York. Margaret is also the author of city proclamations in Cherry Hill, New Jersey and in Garden Grove, California. She also authored the Philadelphia City Council Resolution that declares June 8th as Thomas Paine Day.

ADSN is concerned with discrimination against the Atheist community. ADSN monitors public office positions and public schools. In December of 1991, Margaret filed a discrimination case against the Boy Scouts of America (BSA) through the Human Relations Commission of Pennsylvania. After nearly eight years she lost her case against BSA. In the U.S. Supreme court case James Dale v. Boy Scouts of America, BSA declared itself "private" to avoid the question of open membership thus ending her appeal and many other court cases against BSA's discriminatory membership policy. The ADSN efforts were responsible for convincing movie producer Steven Spielberg to disassociate himself from BSA.

ADSN acts immediately upon negative stereotyping of atheists by writing letters of complaint that demand the offending party to cease hate speech and issue a public apology and/or retraction. ADSN's "Erasing Prejudice" program distributes information and training methods in order to develop a national speaker's bureau that teaches about tolerance and diversity at elementary, secondary, and university levels.

As ADSN's founder and president, Margaret has represented the interest of the nontheist community (since 1995) at several United Nations conferences and spoke at the United Nations Freedom of Religion and Belief meeting in New York City. She attended the 2001 United Nations Freedom of Religion and Belief Conference in Madrid, Spain.