"Invisible" is the debut single by American recording artist Skylar Grey.
 It was officially first released on iTunes on August 9, 2011.
 She performed the track along with various other songs on her upcoming studio album at The Glass House on July 31, 2011, and the song earned placement in the official trailer for the Madonna-directed film "W./E.".
The discography of Skylar Grey (formerly Holly Brook), an American singer-songwriter consists of three studio albums, five extended plays (EPs), 21 singles (including nine as a featured artist) and 14 music videos. Grey was signed to Machine Shop Recordings under the name Holly Brook.
 She released her debut album "Like Blood Like Honey" in 2006, but was released from her contract after it did not perform commercially.
 She began working under the name Skylar Grey in 2010, co-writing the three versions of "Love the Way You Lie" with Alex da Kid, who signed her to his Wonderland Music (now KIDinaKORNER) label.
"I Know You" is a song recorded by American recording artist and songwriter Skylar Grey for the soundtrack to the film "Fifty Shades of Grey" (2015).
 The song was written by Grey and Canadian composer/producer Stephan Moccio and was co-produced by Moccio and Dan Heath.
 It was released as the second promotional single from the "Fifty Shades of Grey" soundtrack on February 3, 2015.
Stephan Moccio is a Grammy and Academy Award-nominated composer, producer, pianist, arranger, conductor and recording artist.
 He co-wrote and co-produced the two end credit songs for "Fifty Shades of Grey" and its soundtrack: "Earned It" (The Weeknd) and "I Know You" (Skylar Grey).
 He also co-wrote Miley Cyrus' single "Wrecking Ball" from her 2013 studio album "Bangerz".
 He co-wrote Celine Dion's hit "A New Day Has Come" with Aldo Nova, which reached and held the number one spot on the Billboard AC Chart for a record breaking 21 weeks.
 For the Vancouver 2010 Winter Olympics, Moccio co-wrote the theme song “I Believe” performed by Nikki Yanofsky.
 He has collaborated with artists such as Seal, The Weeknd, Ellie Goulding, Shaffer "Ne-Yo" Smith, Sarah Brightman, Josh Groban, John Legend, BeBe Winans, Jon Bellion, Gladys Knight, Skylar Grey, Randy Jackson, Jordan Smith, DJ Khalil, Carole Bayer Sager, JC Chasez, Fergie, BC Jean, Planet VI, Boi-1da, as a songwriter, musician and producer.
 Moccio was one of the three judges on "Canada's Got Talent", alongside comedian Martin Short.
"Glorious" is a song by American rapper Macklemore, featuring American singer Skylar Grey.
 The song was written by Macklemore, Skylar Grey, Budo, Tyler Andrews and Tyler Dopps, with production handled by Budo.
 It was released to digital retailers on June 15, 2017, as the lead single from Macklemore's second solo studio album, "Gemini" (2017).
"Wear Me Out" is a song recorded by American recording artist Skylar Grey for her debut studio album "Don't Look Down".
 The song was released on iTunes on June 4, 2013.
 The song was written by Skylar Grey and J.R. Rotem while its production was handled by the latter.
 The song was released onto digital outlets on June 4, 2013.
"Castle Walls" is a song by American singers T.I. and Christina Aguilera, from T.I.'s seventh studio album "No Mercy" (2010).
 Alex da Kid produced the song and co-wrote it along with Skylar Grey and T.I.
 The song was initially produced for Diddy's album "Last Train to Paris", but Diddy felt that "Castle Walls" would be better suited to T.I.; Aguilera was later chosen as the featured artist on the song.
 A hip hop and electro number, "Castle Walls" received mixed response from music critics, some of whom picked it as a highlight from "No Mercy", and some others criticized the song's lyrics.
 Despite not being released as a single, the track still managed to appear on record charts of several nations, including on the US Bubbling Under Hot 100 Singles, where it peaked at number five.
Cannonball is a single released by American singer and songwriter, Skylar Grey.
 The song was written by Grey, Sam Harris, Noah Feldshuh, Casey Harris, Adam Levin and Alex da Kid, produced by the latter, and features the band X Ambassadors.
 "Cannonball" is on "FIFA 16" soundtrack, and was announced by "The Independent".
 It received official digital release on September 25, 2015 "Cannonball" will support the US collaborative tour between Grey and X Ambassadors.
 The song sold around 25,000 digital copies in the United States.
W.E. (stylised as W./E.) is a 2011 British historical romantic drama film co-written and directed by Madonna.
 It stars Abbie Cornish, Andrea Riseborough, Oscar Isaac, Richard Coyle and James D'Arcy.
 The screenplay was co-written by Alek Keshishian, who previously worked with Madonna on her 1991 documentary "" and two of her music videos.
 The film was panned by critics and a box office bomb, returning only a small fraction of its budget in box office revenue.
Natural Causes is the third studio album by American recording artist Skylar Grey.
 It is her second album since her stage name change from Holly Brook to Skylar Grey.
 It was released on September 23, 2016, by KidinaKorner and Interscope Records.

Question: Who co-wrote with Madonna for the film that uses the song "Invisible" by Skylar Grey in its official trailer?
Answer: Alek Keshishian