Henry Milford Tichenor (October 23, 1858 - December 4, 1922) was a writer and magazine editor prominent in the socialist and freethinking movements during the Progressive Era and the Golden Age of Freethought of American history.
 His writings frequently condemned organized religion, Christianity in particular, as a tool used by the upper classes to maintain control over the working class.
 In the realm of opposition to religion, he has been ranked beside Clarence Darrow and Madalyn Murray O'Hair as a leading American freethinker of the twentieth century.
American Atheists is a non-profit activist organization in the United States dedicated to defending the civil liberties of atheists and advocating for the complete separation of church and state.
 It provides speakers for colleges, universities, clubs and the news media.
 It also publishes books and the quarterly "American Atheist Magazine", currently edited by Pamela Whissel.
 The organization was founded by Madalyn Murray O'Hair in 1963, following her role in removing mandatory prayer from public schools.
Frank R. Zindler (born 1939) is an American atheist who served as interim president of the atheist organization American Atheists in 2008.
 He was former professor of biology and geology, and Chairman, Division of Science, Nursing, & Technology, at Fulton-Montgomery Community College of the State University of New York.
 He is both editor of "American Atheist Magazine" and Director of American Atheists Press.
 In the spring of 2011, he published a multi-volume anthology of his short essays and other works.
Minnesota Atheists is the largest atheist organization in the state of Minnesota.
 A 501(c)(3) non-profit organization that seeks to promote the positive contributions of atheism and to maintain the separation of state and church.
 They are affiliated with Atheist Alliance International, and the American Atheists.
 Minnesota Atheists is also part of the Alliance of Secular Humanist Societies, which is connected to the Council for Secular Humanism.
 The organization currently publishes a monthly newsletter, a weekly radio show and podcast called "Atheists Talk", and a community access television show by the same name.
William J. "Bill" Murray III (born May 25, 1946) is an American author, Baptist minister, and social conservative lobbyist who currently serves as the chairman of the Religious Freedom Coalition, a non-profit organization in Washington, D.C., active on issues related to aiding Christians in Islamic and Communist countries.
 The son of the late atheist Madalyn Murray O'Hair, Murray played a significant part alongside his mother in the ending of mandatory prayer in public schools in 1963.
Jon Garth Murray (November 16, 1954 – September 29, 1995) was the second son of late controversial activist Madalyn Murray O'Hair, the first president and founder of American Atheists, Inc., in 1963.
 He was also the half-brother of the reverend William "Bill" Murray.
Sister Maureen Fiedler, Ph.D., is an American activist and radio host and a member of the Sisters of Loretto (not related to the Sisters of Loreto).
 She is a progressive, controversial activist within the Roman Catholic Church.
 She has a long history working with interfaith coalitions on a variety of issues including: social justice, peace, anti-racism work, gender equality, human rights and female ordination in the Catholic Church.
 She holds a doctorate in Government from Georgetown University.
 She is the executive producer and host of the radio show "Interfaith Voices", which she originated.
Ellen Johnson (born 1955) is an American activist for the civil rights of atheists and for the separation of church and state in the United States.
 She served as the president of the organization American Atheists from 1995–2008.
Madalyn Murray O'Hair ("née" Mays; April 13, 1919 – September 29, 1995), who also used multiple pseudonyms (her most preferred being M. Bible), was an American activist, founder of American Atheists, and the organization's president from 1963 to 1986.
 She created the first issues of "American Atheist Magazine".
 One of her sons, Jon Garth Murray, became the nominal president of the organization from 1986 to 1995, but she remained "de facto" president during these nine years.
The Most Hated Woman in America is an American biopic film directed by Tommy O'Haver and written by O'Haver and Irene Turner.
 It stars Melissa Leo as Madalyn Murray O'Hair.

Question: Jon Garth Murray, was the second son of late controversial activist Madalyn Murray O'Hair, was an American activist, founder of American Atheists, and the organization's president, from which span of years?
Answer: 1963 to 1986