Question: Which American activist directed Flipped?

Context paragraphs:
Arlo Looking Cloud: Arlo Looking Cloud was a Native American activist.  He is perhaps best known for his involvement with the murder of fellow American Indian Movement activist Anna Mae Aquash.

Theda Nelson Clarke: Theda Nelson Clarke, born Theda Rose Nelson, was a Native American activist.  She is perhaps best known for her involvement in the Wounded Knee incident with the murder of fellow American Indian Movement activist Anna Mae Aquash.

Gregoria Ortega: Gregoria Ortega is a Mexican American activist and nun.  She is best known for her support of students in an Abilene school walkout and her co-creation of the religious organization for Hispanic nuns and lay women in the Catholic Church, Las Hermanas.  She continues work as an activist today.

Flipped (film): Flipped is a 2010 American romantic comedy-drama film directed by Rob Reiner and based on Wendelin Van Draanen's novel of the same name.  It began a limited release in the United States on August 6, 2010, followed by a wider release on September 10.

Thelma Conroy-Rios: Thelma Conroy-Rios, was a Native American activist.  She is perhaps best known for her involvement in the Wounded Knee incident with the murder of fellow American Indian Movement activist Anna Mae Aquash.

John Graham (Canadian activist): John Graham, who allegedly went by the alias John Boy Patton and John Boy Patten in the presence of members of the American Indian Movement, was a Native American activist.  He is perhaps best known for being the person who executed fellow American Indian Movement activist Anna Mae Aquash using a firearm.

Thunderheart: Thunderheart is a 1992 contemporary western mystery film directed by Michael Apted from an original screenplay by John Fusco.  The film is a loosely based fictional portrayal of events relating to the Wounded Knee incident in 1973, when followers of the American Indian Movement seized the South Dakota town of Wounded Knee in protest against federal government policy regarding Native Americans.  Incorporated in the plot is the character of Ray Levoi, played by actor Val Kilmer, as an FBI agent with Sioux heritage investigating a murder on a Native American reservation.  Sam Shepard, Graham Greene, Fred Ward and Sheila Tousey star in principal supporting roles.  Also in 1992, Apted had previously directed a documentary surrounding a Native American activist episode involving the murder of FBI agents titled "Incident at Oglala".  The documentary depicts the indictment of activist Leonard Peltier during a 1975 shootout on the Pine Ridge Indian Reservation.

Dan C. Tsang: Daniel Chuen-Tuen Tsang is an activist and scholar whose writings have been of great importance in the Asian American and LGBT political movements.  Tsang worked with early activist organizations such as the Gay Liberation Front in Ann Arbor, Michigan, the Graduate Employees' Organization (GEO), and East Wind, an Asian American activist organization.  Tsang also worked as a librarian for Temple University, Community College of Philadelphia, Free Library of Philadelphia and the University of California, Irvine.

Alan Haber: Robert Alan Haber is an American activist.  He was the first president of Students for a Democratic Society (SDS), a U.S. radical student activist organization.  Haber was elected at the first meeting of SDS in 1960.  FBI files at the time indicated his official title as Field Secretary.  Described variously at the time as "Ann Arbor's resident radical" and "reticent visionary", Haber organized a human rights conference in April of that year which "marked the debut of SDS" and invited four organizers of the 1960 NAACP sit-ins against segregated lunch counters in Greensboro, North Carolina.

Rob Reiner: Robert Reiner (born March 6, 1947) is an American actor, writer, director, producer, and activist.  As an actor, Reiner first came to national prominence with the role of Michael Stivic on "All in the Family" (1971–79).  That role earned him two Emmy Awards during the 1970s.  As a director, Reiner was recognized by the Directors Guild of America (DGA) with nominations for the coming of age comedy-drama film "Stand by Me" (1986), the romantic comedy "When Harry Met Sally..." (1989), and the military courtroom drama "A Few Good Men" (1992).  He also directed the psychological horror-thriller "Misery" (1990), the romantic comedy fantasy adventure "The Princess Bride" (1987) and the heavy metal mockumentary "This Is Spinal Tap" (1984).

Supporting paragraphs: Flipped (film) Rob Reiner
Answer: Rob Reiner