Question: Who was the English songwriter Quincy Jones and Lionel Richie teamed up with to write a song for the move The Color Purple?

Context articles: Rod Temperton
Keith Diamond (songwriter)
We Are the World
Stuck on You (Lionel Richie song)
Bill Summers (musician)
Scott Sanders (producer)
We Are the World 25 for Haiti
Lionel Richie (album)
Just Go (album)
Miss Celie's Blues

Rodney Lynn "Rod" Temperton (9 October 1949 – September/October 2016) was an English songwriter, record producer and musician.
 He initially made his mark as the keyboardist and main songwriter for the 1970s R&B, funk and disco band Heatwave, whose hit songs included "Boogie Nights" and "Always and Forever".
Keith Diamond (born Keith Vincent Constantine Alexander; March 11, 1950 – January 18, 1997) was a songwriter and producer who worked with artists such as Donna Summer, Michael Bolton, Sheena Easton, Mick Jagger and Don Johnson.
 Diamond also produced and co-wrote Billy Ocean's "Suddenly," "Caribbean Queen (No More Love On The Run)," "Loverboy" and "Mystery Lady," as well as producing and managing groups such as Starpoint and Fredrick Thomas.
 Keith Diamond also produced and co-wrote James Ingram's album entitled "Never Felt So Good" in 1986, at the request of Quincy Jones who was tied up with scoring the film "The Color Purple".
"We Are the World" is a song and charity single originally recorded by the supergroup United Support of Artists (USA) for Africa in 1985.
 It was written by Michael Jackson and Lionel Richie (with arrangements by Michael Omartian) and produced by Quincy Jones for the album "We Are the World".
 With sales in excess of 20 million copies, it is one of the fewer than 30 all-time physical singles to have sold at least 10 million copies worldwide.
"Stuck on You" is a song written by and originally recorded by Lionel Richie.
 It was the fourth single released from his second studio album "Can't Slow Down" released on May 1, 1984, by Motown, and achieved chart success, particularly in the U.S. and the UK, where it peaked at number three and number 12, respectively.
 The song differs from Richie's other compositions, as it displays a country pop influence rather than R&B.
 As such, the single's cover photo shows Richie wearing a cowboy hat, and indeed, "Stuck on You" peaked at number 24 on the country chart.
 "Stuck on You" reached number one on the Adult Contemporary chart, Richie's seventh chart topper.
 The song marks Lionel Richie's country music debut.
Bill Summers (b. June 27, 1948) is a New Orleans based Afro-Cuban jazz/Latin jazz percussionist, a multi-instrumentalist who plays primarily on conga drums.
 Summers is probably best known for to his work with Los Hombres Calientes along with his friend and co-leader of the group, trumpeter Irvin Mayfield.
 However, despite this musical relationship, Summers has a much longer musical career than that, often working behind the scenes on film scores for various movies such as "The Color Purple" and the television miniseries "Roots" with Quincy Jones.
 He also played with Herbie Hancock during The Headhunters years, and is mentioned in passing by the liner notes of The Headhunters' 2003 release "Evolution Revolution" as contributing to that recording.
 His former wife is Yvette Bostic-Summers, who often sings on Los Hombres' albums.
Scott Sanders (born 1957) is an American television producer, film producer and theatrical producer.
 He is best known for the theatrical musical version of Alice Walker’s novel "The Color Purple", of which he was Lead Producer along with Oprah Winfrey, Quincy Jones, and Harvey Weinstein, for producing "Elaine Stritch: at Liberty" and the 2012 revival of the musical "Evita", and for his work on numerous musical and theatrical productions.
"We Are the World 25 for Haiti" is a charity single recorded by the supergroup Artists for Haiti in 2010.
 It is a remake of the 1985 hit song "We Are the World", which was written by American musicians Michael Jackson and Lionel Richie, and was recorded by USA for Africa to benefit famine relief in Africa.
 Initially, in late 2009, it had been suggested to Richie and Quincy Jones—producer of the original "We Are the World"—that a re-cut version of the song be re-released under the title "Live 25".
 Following the magnitude 7.0 M earthquake in Haiti, which devastated the area and killed thousands of people, it was agreed that the song would be re-recorded by new artists, in the hope that it would reach a new generation and help benefit the people of Haiti.
Lionel Richie is the eponymous debut solo studio album by American singer Lionel Richie, released on October 6, 1982 on Motown Records.
 It was recorded and released while Richie was still a member of the Commodores; he would leave the group shortly after the album's release.
 The first single from the album, "Truly", topped the "Billboard" Hot 100.
 Follow-up single "You Are" reached number four, and "My Love" reached number five.
 The album was also a hit, reaching number one on the "Cashbox" albums chart on December 11, 1982.
Just Go is the ninth studio album by Lionel Richie.
 The album was slated to be released in US on March 10, 2009, but was pushed back to May 19, 2009.
 In the UK, the album was released as scheduled on March 16, 2009.
 The International release date was March 13, 2009.
 Akon and Ne-Yo share in the writing duties for the new album, along with Norwegian production team StarGate.
 "Just Go" also has contributions from songwriter Johntá Austin and The-Dream.
 Although Richie did not write a song for the album, he did write "Eternity", which is also included on the tribute album "".
Miss Celie's Blues, also known as "Sister", is a song from the Steven Spielberg movie "The Color Purple" (1985), with music by Quincy Jones and Rod Temperton and lyrics by the two of them with Lionel Richie.
 The song was nominated for an Academy Award for Best Music, Original Song in 1986.