Question: The founder of what American indie folk band also led DeYarmond Edison featuring Field Report's Christopher Porterfield? 

Context paragraphs:
DeYarmond Edison: DeYarmond Edison is the former band of the members of Bon Iver, Megafaun, and Field Report.  Guitarist and vocalist Justin Vernon went on to create Bon Iver; three members (Brad Cook: bass, guitar; Phil Cook: keyboards, banjo; Joe Westerlund: Percussion) formed the freak folk group Megafaun, and Christopher Porterfield began composing, eventually establishing Field Report.

Phil Cook (musician): Phil Cook is an American guitarist, banjoist, pianist and singer.  He is a member of the freak-folk band Megafaun.  Before he became a member of Megafaun, Cook was part of DeYarmond Edison, a band led by Bon Iver's Justin Vernon.  He also plays in the band Gayngs as well as the Vernon-fronted Shouting Matches.  Beyond his musical career, Cook works at the Center for Inquiry Based Learning at Duke University where he "assembles hands-on science kits for elementary schools."  Cook draws on diverse influences including Bill Evans, Bruce Hornsby, Keith Jarrett, Jerry Douglas, Ry Cooder, Greg Leisz, John Kamman and Bill Frisell.

Bon Iver: Bon Iver ( Bone-ee-VARE) is an American indie folk band founded in 2006 by singer-songwriter Justin Vernon.  The name "Bon Iver" is derived from the French phrase "bon hiver" (] ), meaning "good winter", taken from a greeting on "Northern Exposure".

The Head and the Heart: The Head and the Heart is an American indie folk band.  They were formed in the summer of 2009 by Josiah Johnson (vocals, guitar, percussion) and Jonathan Russell (vocals, guitar, percussion).  The band also includes Charity Rose Thielen (violin, guitar, vocals), Chris Zasche (bass), Kenny Hensley (piano), and Tyler Williams (drums).  The band is signed to Warner Bros.  Records and have released three albums thus far.  Since March 2016, Johnson has been on hiatus due to drug addiction-related issues.  The band has toured in both North America and Europe.

Reuben and the Dark: Reuben and the Dark are a Canadian indie folk band from Calgary, Alberta.  Led by singer and songwriter Reuben Bullock, the band also currently includes Shea Alain (guitar/keys), Brock Geiger (guitar/keys), Ian Jarvis (bass), and "Pico Pollo" Dino Soares (drums).

Justin Vernon: Justin DeYarmond Edison Vernon (born April 30, 1981) is an American multi-instrumentalist, singer, songwriter and producer.  He is best known as the primary songwriter and frontman of indie folk band Bon Iver.  Vernon is also a member of the bands Volcano Choir, The Shouting Matches and Gayngs, and was a member of the now-defunct band DeYarmond Edison.

Field Report: Field Report is an American folk band from Milwaukee, Wisconsin led by singer/songwriter Christopher Porterfield.  The band's name is an anagram of the surname Porterfield.

Homemade Knives: Homemade Knives is an American Indie folk band formed by Wil Loyal, Shane Jenkins, and Christopher Carroll.  Their music features layered of acoustic guitars, cello, and lead vocals.  Homemade Knives has played with bands such as Magnolia Electric Company, Catfish Haven, and DeYarmond Edison.  As of July 27, 2012, Homemade Knives are signed with Triple Stamp Records.

For Emma, Forever Ago: For Emma, Forever Ago is the debut studio album by American indie folk band Bon Iver.  It was first self-released in July 2007, and later saw wide release on the Jagjaguwar label in February 2008.  The album is principally the work of singer-songwriter Justin Vernon, who had previously performed in the band DeYarmond Edison.  After college, the group moved to Raleigh, North Carolina, but broke up in 2006.  Vernon fell ill with mononucleosis and a liver infection, and grew frustrated with his songwriting and life.  He left Raleigh and drove an hour northwest of his hometown, Eau Claire, Wisconsin, hoping to be alone.

Christopher Porterfield: Christopher Porterfield is an American songwriter, guitarist and singer.  He currently leads the folk band Field Report.  Porterfield previously played with DeYarmond Edison, a band led by Bon Iver frontman Justin Vernon.  He graduated from the University of Wisconsin-Eau Claire with a degree in journalism.

Supporting paragraphs: Christopher Porterfield Bon Iver
Answer: Bon Iver