Question: Which frequent collaborator of G-Eazy was an executive producer for his second album?

Context articles: Slowness (album)
When It's Dark Out
Where Somebody Waits For Me
Travis Barker
Come Fill Your Glass with Us
Jonathan Shapiro (writer)
Save Room
G-Eazy
The Underside of Power
Released (Patti LaBelle album)

Slowness is the seventh studio album by Hong Kong recording artist Kay Tse.
 It was released on December 21, 2009, by Cinepoly Records.
 The theme of the album is slowness, pointing out how life in urban cities is becoming increasingly restless and fast-paced.
 Tse worked with several producers in this album, most notably her frequent collaborator, the songwriter Adrain Chow.
 He is also the executive producer for the album.
 Musically, the album consists of slow-tempo cantopop while incorporating jazz elements.
When It's Dark Out is the third studio album by American rapper G-Eazy.
 It was first made available for a pre-order on iTunes on November 27, 2015.
 It was released on December 4, 2015, by RCA Records.
 Recording sessions took place during 2014 to 2015, with G-Eazy himself, alongside his frequent collaborator Christoph Andersson, and record producer Southside were serving as the executive producers on the album.
 The album features guest appearances from rappers E-40 and Big Sean, alongside recording artists Kehlani and Grace, while the production was provided by OZ, DJ Spinz, Boi-1da and Michael Keenan, among others.
"Where Somebody Waits For Me" is the sixteenth episode of "Pretty Little Liars"' sixth season, and the 136th episode overall.
 It first aired on the Freeform network in the United States on February 16, 2016.
 The episode was directed and written by executive producer and frequent collaborator Joseph Dougherty.
 In the episode, new relationships cause confusion and tense moments.
 The Liars start to investigate Sara Harvey, while themselves being investigated by Detective Tanner.
Travis Landon Barker (born November 14, 1975) is an American musician and producer, best known as the drummer for the rock band Blink-182.
 Barker has also performed as a frequent collaborator with hip hop artists, is a member of the rap rock group Transplants, founded the rock bands +44 and Box Car Racer, and most recently joined Antemasque and Goldfinger.
 He was a frequent collaborator with the late DJ AM, and together they formed TRV$DJAM.
 Due to his fame, "Rolling Stone" referred to him as "punk's first superstar drummer."
Come Fill Your Glass with Us: Irish Songs of Drinking & Blackguarding is a collection of traditional Irish drinking songs that first brought The Clancy Brothers and their frequent collaborator Tommy Makem to prominence.
 It was their second album and was released in 1959 by Tradition Records, a small music label run by one of the Clancy Brothers, Paddy Clancy.
 A reviewer for the folk and world music magazine, "Dirty Linen", later called this the album that "launched the Clancy Brothers to fame in the Americas and helped launch a revival of interest in traditional Irish music."
Jonathan Shapiro is a writer, producer, attorney and former Assistant U.S. Attorney as well as Of Counsel at Kirkland & Ellis.
 He is the co-creator and Executive Producer, with David E. Kelley, of Amazon Prime's TV show "Goliath" starring Billy Bob Thornton.
 Shapiro has written fiction, for example a book entitled "Deadly Force: A Lizzie Scott Novel" (ABA Publishing 2014) as well as non-fiction, e.g. another book named "Lawyers, Liars, and the Art of Storytelling" (Ankerwycke 2015).
 Shapiro has also written episodes of TV shows such as "The Blacklist", "Boston Legal", "The Practice" and "Life" and is also a frequent collaborator of fellow attorney-writer-producer David E. Kelley.
"Save Room" is a song by American recording artist John Legend, taken from his second album, "Once Again" (2006).
 A joyful love song, it was written by Legend along with will.i.am, Jessyca Wilson, Buddy Buie, and James B. Cobb, Jr. and built along a sample of Gábor Szabó's version of the Classics IV hit "Stormy" which was brought in by frequent collaborator Kanye West.
 Production was helmed by both Legend and will.i.am.
Gerald Earl Gillum (born May 24, 1989), better known by his stage name G-Eazy, is an American rapper and record producer from Oakland, California.
 His first major-label album, "These Things Happen", was released on June 23, 2014.
 The album peaked at number 3 on the US "Billboard" 200.
 His second studio album, "When It's Dark Out", was released on December 4, 2015.
 It featured the single "Me, Myself & I", which reached the top 10 of the US "Billboard" Hot 100.
The Underside of Power is the second album by American experimental band Algiers.
 The album was released through Matador Records on June 23, 2017.
 The album was produced by Adrian Utley of Portishead and his frequent collaborator Ali Chant.
 It was also the band's first album to feature drummer Matt Tong as a full-time member.
Released is the fourth studio solo album released by recording artist Patti LaBelle.
 LaBelle's final album released by Epic, she would later sign with Philadelphia International Records.
 The album featured the hits "I Don't Go Shopping", written by previous collaborator David Lasley and musician Peter Allen, and the title track, "Release (The Tension)", which was written by funk legend Allen Toussaint, who produced the entire album.
 The title track found some international success upon its release while "I Don't Go Shopping" was her first top 40 R&B charted single since 1977.
 Along with her frequent collaborator, James "Budd" Ellison, LaBelle lyrically co-wrote virtually the second half of the album.