Question: Who directed the other film about Christine Chubbuck besides Kate Plays Christine at the 2016 Sundance Film Festival?

Context articles: Sand Storm (2016 film)
Christine (2016 film)
Nate Parker
Kate Plays Christine
Andrew Ahn
Sundance Film Festival
Little Men (2016 film)
Jacqueline Argentine
Heidi Ewing
Robert Greene (filmmaker)

Sand Storm (Hebrew: סופת חול‎ "Sufat Chol") is a 2016 Israeli drama film directed by Elite Zexer.
 It was shown in the Panorama section at the 66th Berlin International Film Festival.
 At the 2016 Sundance Film Festival it won the Grand Jury Prize in the World Cinema Dramatic section.
 It won the Best Film Award at the Ophir Awards.
 It was selected as the Israeli entry for the Best Foreign Language Film at the 89th Academy Awards but it was not nominated.
Christine is a 2016 American-British biographical drama film directed by Antonio Campos and written by Craig Shilowich.
 It stars actress Rebecca Hall as news reporter Christine Chubbuck struggling with depression, along with professional and personal frustrations as she tries to advance her career.
Nate Parker (born November 18, 1979) is an American actor, director, producer, writer, and musical performer who has appeared in "Beyond the Lights", "Red Tails", "The Secret Life of Bees", "The Great Debaters", "Arbitrage", "Non-Stop", "Felon", and "Pride".
 Parker's directorial debut feature film, "The Birth of a Nation", in which he also starred, made history at the 2016 Sundance Film Festival when Fox Searchlight Pictures acquired the distribution rights for $17.5 million, breaking the record for the most paid for a Sundance Film Festival production, surpassing "Little Miss Sunshine", which had been acquired by Searchlight for $10 million ten years earlier.
Kate Plays Christine is a 2016 American documentary film written and directed by Robert Greene.
 It follows actress Kate Lyn Sheil's preparation for the role of Christine Chubbuck, a newscaster who committed suicide on live television in 1974.
 It is one of the two films about Chubbuck that premiered at the 2016 Sundance Film Festival, the other being "Christine".
Andrew Ahn is an American filmmaker born and raised in Los Angeles.
 His short film "Dol (First Birthday)" premiered at the 2012 Sundance Film Festival.
 His 2016 feature film "Spa Night" premiered at the 2016 Sundance Film Festival.
The Sundance Film Festival, a program of the Sundance Institute, is a film festival that takes place annually in Park City, Utah.
 With over 46,660 attendees in 2016, it is the largest independent film festival in the United States.
 Held in January in Park City and Salt Lake City, Utah, as well as at the Sundance Resort, the festival is a showcase for new work from American and international independent filmmakers.
 The festival comprises competitive sections for American and international dramatic and documentary films, both feature films and short films, and a group of out-of-competition sections, including NEXT, New Frontier, Spotlight, Midnight, Premieres and Documentary Premieres.
 The 2017 Sundance Film Festival took place from January 19 to January 29, 2017.
Little Men is a 2016 American drama film directed by Ira Sachs.
 It had its world premiere at the 2016 Sundance Film Festival and had its European premiere as a cross-section selection in the Generations and Panorama sections at the 66th Berlin International Film Festival.
Jacqueline Argentine, sometimes stylized as Jacqueline (Argentine), is a 2016 comedy-drama film directed by Bernardo Britto, supported by the Sundance Institute's Feature Film Program.
 It premiered at the 2016 Sundance Film Festival.
 The film concerns an unnamed filmmaker (Wyatt Cenac), who receives a sensitive tip from a French spy in hiding (Camille Rutherford).
Heidi Ewing is a director, producer, and writer of documentary films.
 She and Rachel Grady founded Loki Films in 2001, and have collaborated on several documentaries together.
 She is best known as the co-director of "Jesus Camp", which was nominated for an Academy Award for best documentary in 2006.
 Next came"12th & Delaware" (HBO), which premiered at the 2010 Sundance Film Festival.
 The film "casts a heart-rending light on the abortion divide" (LA Times) and was honored with a Peabody Award.
 "Detropia", a poetic look at Ewing's home town, also won several awards, including Best Editing at Sundance 2012, Outstanding Direction and Outstanding Original Score, at the 2013 Cinema Eye Honors for Nonfiction Filmmaking and a News and Documentary Emmy for editing.
 "Norman Lear: Just Another Version of You" was the opening night selection of the 2016 Sundance Film Festival and premiered on PBS American Masters on October 25, 2016.
 Other films as a director include "The Boys of Baraka", "Freakonomics", and "The Education of Mohammed Hussein".
Robert Greene (born May 25, 1976) is an American documentary filmmaker, editor and writer.
 His documentaries include "Kate Plays Christine", "Actress", and "Fake it So Real".
 He was named one of the 10 Filmmakers to Watch in 2014 by The Independent, and is “filmmaker-in-chief” at the Murray Center for Documentary Journalism at the University of Missouri, beginning in 2015.