Question:  John Mathieson, BSC is one of a group of film makers who emerged from the music video industry whose peers include the director of  a 2007 British romantic war drama that chronicles a crime and its consequences over the course of how many decades? 
Context: Romantic Warriors: A Progressive Music Saga is a feature-length documentary film written and directed by José Zegarra Holder and Adele Schmidt, released in 2010 as the first part of a series dedicated to progressive rock as an artistic, cultural and social phenomenon.  The project reflects the film makers' love of a music genre that has made a strong comeback in the early 21st century – four decades after its Seventies heyday – although without regaining the commercial appeal of the original movement.  "Romantic Warriors" was positively received by long-time followers of the genre, and sparked interest also outside the boundaries of the progressive rock fandom. Joseph "Joe" Wright (born 25 August 1972) is an English film director.  His motion pictures include the romance film "Pride & Prejudice" (2005), the romantic war drama "Atonement" (2007), the action thriller "Hanna" (2011), his adaptation of "Anna Karenina" (2012), Peter Pan origin story "Pan" (2015), and political drama "Darkest Hour" (2017). Rubin Schron, who goes by Ruby, is a New York City real estate investor, landlord and the founder of Cammeby's International Group.  He has a personal net worth of well over $10 billion, according to data company Real Capital Analytics.  The portfolio of Cammeby's, which Schron founded in 1967, includes office buildings, market-rate and government-subsidized apartment complexes, nursing homes, the 16-building complex in Sunset Park now known as Industry City, a stake in the bottom half of Woolworth Building and industrial properties scattered across Long Island.  In 2013, Schron made an unsolicited and unsuccessful offer to buy the Empire State Building for $2 billion, but he has not had problems closing many other deals throughout his long career.  In 2003, an investment group led by Schron paid $600 million for a portfolio of about 6,000 outer-borough apartments from Donald Trump.  Other buildings he owns include the Monterey, a 521-unit rental multifamily building on Manhattan's Upper East Side; over the decades, Schron has also amassed a portfolio of Mitchell-Lama apartment buildings whose values have been skyrocketing to record values, after reverting to market rates when government subsidies expired.  In 2007, he sold nearly 4,000 units of former Mitchell-Lama properties in five complexes in Harlem and on Roosevelt Island for $940 million.  Schron, who practices Orthodox Judaism, has eight children and 50 grandchildren.  He and his family have lived in the same single-family home in Brooklyn for many decades. Boyd Estus is a director of photography and producer/director in the motion picture industry whose credits include the Academy Award-winning "The Flight of the Gossamer Condor", the Academy Award-nominated "Eight Minutes to Midnight", and many Emmy-winning television programs.  He has worked on location around the world shooting and directing feature films and documentaries. Chakurartha Devadithya Gardiyawasam Lindamulage Roy Aloysius Felix de Silva, popularly as Roy de Silva, (රෝයි ද සිල්වා) is an actor, Film director in Sri Lankan cinema (born 30 August 1937).  He entered the film industry as an actor in 1964 with "Sujage Rahasa" directed by Palaniyaandi Neelakantan.  Arose as an actor, Silva immediately changed the pathway towards cinema direction, becoming one of Sri Lanka's most successful film makers in the Sri Lanka film industry.  His blockbuster movies such as "Re Daniel Dawal Migel" series, "Cheriyo" series, "Clean Out", and "Sir Last Chance" were economically successful and made hallmarks in the industry. Pro-Active Entertainment Group was a United States movie distributing company based in Rancho Mirage California and founded by Leonard Levy.  In the early 2000s, the company distributed or re-distributed many movies, including "The Satanic Rites of Dracula", "Lost on Mars" and "The Fat Spy".  The company had several notable contracts with Raven Moon Entertainment, Inc, Ingram Entertainment Holdings Inc. and Baker & Taylor.  Under its contract with Raven Moon Entertainment, Inc., it purchased DVDs such as "Gina D's Kids Club", "Sing A Long With Gina", and "Smile-Ability", and distributed them to major retail and video stores such as Family Video, Premiere Video, Blockbuster Video, Costco, Hollywood Video, Best Buy, Ingram, Music Land, Borders, Circuit City, Sam's Club, K-mart, Wal-Mart, Sun Coast, Albertsons, Kroger and County Market.  Improved technology such as inexpensive computer software, cameras and other equipment helped to lower production costs, enabling many filmmakers without significant financial backing to produce films, especially for the direct-to-video or direct-to-television markets.  Pro-Active Entertainment Group was among the distribution leaders for these new markets.  Video recording, once viewed as a threat, proved to be a new source of income for home entertainment distributors.  In addition to new releases, distributors re-mastered and re-released older films.  Using the internet and help from other major distributors such as Ingram Entertainment and Baker & Taylor, the Pro-Active Entertainment Group helped many film makers distribute their products.  Pro-Active Entertainment Group operated in California and Tennessee, managed by Levy's associate, Richard Mendelson.  The company closed after running into legal troubles with Backyard Wrestling, Inc. M. J. Radhakrishnan is an award-winning Indian cinematographer working mainly in Malayalam films.  Recently completed his first Telugu film directed by K. N. T. Sastry titled "SHAANU" produced by CFSI (Children's Film Society of India.  He has won Kerala State Award for Best Cinematography 7 times(the most), equaling with Mankada Ravi Varma.  Earlier he worked as a still photographer and then as an associate to renowned cinematographer turned director Shaji N. Karun.  His important works include "Deshadanam", "Karunam" and "Naalu Pennungal".  His films have been screened at several prominent film festivals around the world including Cannes, Toronto, Chicago, Rhode Island and Rotterdam.  One of his works, "Marana Simhasanam" (English: Throne of Death, French: Le Trone de la mort), won Caméra d'Or (Golden Camera Award) in the Un Certain Regard section at the 1999 Cannes Film Festival.  He has worked for over 75 feature films and several documentaries and has worked with some of the prominent Indian film makers including Adoor Gopalakrishnan, Murali Nair, Shaji N. Karun, TV Chandran, Dr. Biju, Jayaraj and Renjith.  He mostly works on arthouse films and is known for his natural lighting styles.In a career spanning more than two decades, he has worked with a number of young film makers, mostly in their maiden ventures. Atonement is a 2007 British romantic war drama film directed by Joe Wright and based on Ian McEwan's 2001 novel of the same name.  The film stars James McAvoy, Keira Knightley, Saoirse Ronan, Romola Garai and Vanessa Redgrave, and chronicles a crime and its consequences over the course of six decades, beginning in the 1930s.  It was produced by Working Title Films and filmed in England.  Distributed in most of the world by Universal Studios, it was released in the United Kingdom and Ireland on 7 September 2007 and in North America on 7 December 2007. John Mathieson, BSC (born 3 May 1961) is an English cinematographer.  He is one of a group of film makers who emerged from the music video industry of the late 1980s and 1990s.  His peers include cinematographers Tim Maurice Jones ("Lock Stock and Two Smoking Barrels") and Seamus McGarvey BSC ("Atonement") and directors Michel Gondry and David Fincher.  The inventiveness and visual style of music videos did much to shape the evolution of contemporary feature films. "Atonement" is a 2007 British romantic World War II film directed by Joe Wright.  Christopher Hampton adapted the screenplay from the eponymous novel by Ian McEwan.  The film focuses on fictional lovers Cecilia (Keira Knightley) and Robbie (James McAvoy), whose lives are ruined when Cecilia's younger sister, Briony (Saoirse Ronan), falsely accuses Robbie of a serious crime.  The film opened the 64th Venice International Film Festival on 29 August 2007 and competed for the Golden Lion.  The following month it screened at the Vancouver International Film Festival and the Toronto International Film Festival.  "Atonement" was released in the United Kingdom by Universal Studios on 7 September 2007.  It was then released in the United States by Focus Features on 7 December 2007.  The film earned over £84 million in its combined total gross at the box office.
Answer: six