Question: Which American focused on the realm of opposition to religion during the Golden Age of Freethought was parent to Jon Garth Murray?
Context: Truth Seeker is an American periodical published beginning during the 19th century.  It was considered the most influential Freethought publication during the period following the Civil War into the first decades of the 20th Century, known as the Golden Age of Freethought.  Though there were other influential Freethought periodicals, "Truth Seeker" was the only one with a national circulation.  The headquarters is in San Diego, California. 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. Watson Heston (September 25, 1846 – January 27, 1905) was an American Editorial cartoonist who peaked in popularity during the Golden Age of Freethought in the late 19th century.  Born in Ohio, he spent the majority of his life in Carthage, Missouri.  He published cartoons satirising the Republican party in People's Party publications, and his cartoons satirising religion in general and Christianity in particular, appeared in the famous freethought newspapers "Truth Seeker", Etta Semple's "Free-Thought Ideal", and other regional papers.  Later, he would write and illustrate "The Old Testament Comically Illustrated" (1892), and "The New Testament Comically Illustrated" (1898), which caricature scenes from the Bible.  In 1890, Heston published a critique of the involvement of religious clergy in politics, calling for strict separation of church and state. The Golden Age of Trucking Museum is a defunct trucking museum in Middlebury, Connecticut, United States.  Founded in 1998 by Richard and Frances Guerrera, it was non-profit organization dedicated to trucking that focused on trucks of the 1950s.  The museum was dedicated on September 23, 2002 and housed in a 32,000 square foot building.  It featured a collection of historic and antique vehicles including the first registered car in Connecticut, a 1928 Pierce-Arrow Motor Car Company dump truck.  Among the trucks in the museum were Mack Trucks, GMC and Autocar Company trucks, including a 1963 Mack B61 motivated Guerrera to found the museum.  The Golden Age of Trucking Museum also featured a collection of toy trucks, hats, state license plates and images relating to trucking.  Throughout its entire operation, the museum ran a deficit and it closed after a 2009 fund raising campaign failed.  The museum's final day of operation was on July 20, 2010.  The economic impact of the museums closure was expected to be low, but according to Steven Frischling of the "Boston Globe".  the Golden Age of Trucking Museum made its mark on the auto world. The Golden Age of Freethought describes the socio-political movement promoting freethought that developed in the mid 19th-century United States.  The period roughly from 1875 to 1914 is referred to as "the high-water mark of freethought as an influential movement in American society".  It began around 1856 and lasted at least through the end of the century; author Susan Jacoby places the end of the Golden Age at the start of World War I. The Polish Golden Age refers to the period from the late 15th century Jagiellon Poland to the death of the last of the Jagiellons, Sigismund August in 1572.  Some historians claim that the Golden Age lasted until the mid-17th century, when in 1648 the Polish-Lithuanian Commonwealth was ravaged by the Khmelnytsky Uprising, and Swedish invasion.  During its Golden Age, the Commonwealth became one of the largest kingdoms of Europe, stretching from modern-day Estonia, to Moldavia and Silesia.  Its army was able to defend the realm against numerous Teutonic knights, Turkish, Swedish, Russian, and Tatar invasions.  The country prospered thanks to its enormous grain, wood and salt exports. The Freedom From Religion Foundation (FFRF) is an American non-profit organization based in Madison, Wisconsin with members from all 50 states.  The largest national organization advocating for non-theists, FFRF promotes the separation of church and state and educates the public on matters relating to atheism, agnosticism, and nontheism.  The FFRF publishes a newspaper, "Freethought Today" 10 times a year.  Since 2006, as the Freethought Radio Network, FFRF has produced the "Freethought Radio" show. 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. 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. Berserk: The Golden Age Arc (Japanese: ベルセルク 黄金時代篇 , Hepburn: Beruseruku Ōgon Jidai-hen ) is a series of films, an effort to adapt the Golden Age Arc of Kentaro Miura's "Berserk" manga series.  The project was first announced as a new anime project in September 2010 on a wraparound jacket band on volume 35 of the "Berserk" manga.  The first two films, "Berserk: The Golden Age Arc I - The Egg of the King" and "Berserk: The Golden Age Arc II - The Battle for Doldrey", were released in Japan in February and June 2012, with the third film, "Berserk: The Golden Age Arc III - The Advent", released in February 2013.  The third film also marks the first time new footage based on the manga has been animated beyond the storyline of the TV show.  Viz Media has licensed all three films for a home video release.  The first film was released on (DVD/Blu-ray) November 27, 2012, the second on August 6, 2013, and the third on April 15, 2014 in the United States.
Answer: Madalyn Murray O'Hair