Question: Which artist, Jaren Johnston or Jesse Michaels is part of the group Operation Ivy?

Context paragraphs:
Energy (Operation Ivy album): Energy is the only studio album by the Berkeley, California-based ska punk band Operation Ivy.  It was originally released on vinyl and cassette in May 1989 through Lookout Records with the catalog number LK 010.  Although the album itself has never been released on CD, all of the tracks were featured on the career-spanning compilation "Operation Ivy" issued by Lookout in 1991.  Despite achieving no mainstream success, "Energy" is considered one of the most important albums of ska punk and is frequently cited as an influence by many later bands of the genre.

Plea for Peace (EP): Plea for Peace is the final EP by the American punk rock band Operation Ivy.  It was released in February 1992, three years after they disbanded, through M&E Records.  "Plea for Peace" contained four songs not featured on any of Operation Ivy's studio releases.

Classics of Love: Classics of Love is an American punk rock band from the San Francisco Bay Area, formed in 2008.  The band consists of singer Jesse Michaels (formerly of Operation Ivy, Big Rig, and Common Rider) with guitarist Mike Huguenor, bassist Morgan Herrell, and drummer Max Feshbach (who comprise San Jose punk trio Hard Girls).  Signed to Asian Man Records, Classics of Love released their debut, the "Walking in Shadows EP", in 2009, followed by a single in 2010 and an eponymously titled album in 2012.

Knowledge (song): "Knowledge" is a song by American band Operation Ivy.  It was written by lead vocalist Jesse Michaels and appeared on the album "Energy."

Jaren Johnston: Jaren Johnston (born October 4, 1980) is an American country music and rock singer and songwriter.  He is a member of the group The Cadillac Three.

39/Smooth: 39/Smooth is the debut studio album by American punk rock band Green Day, released on April 13, 1990, by Lookout Records on vinyl (black and green) and cassette.  It is the band's only studio album to feature original drummer John Kiffmeyer.  Jesse Michaels of Operation Ivy contributed the artwork on the album.  The inner sleeve shows handwritten lyrics by Billie Joe Armstrong and letters by drummer John Kiffmeyer and Lookout owner Larry Livermore to I.R.S. Records, rejecting an offer to sign to the label and declaring its loyalty to Lookout!  Records (however, the band would later leave Lookout!  and move to a major label, Reprise Records).  Although it is currently out of print, "39/Smooth" was later rereleased, along with the group's two previous extended plays "Slappy", "1,000 Hours" and the song "I Want to Be Alone" (from "The Big One", a compilation album released by Flipside Records in 1990) on the compilation album "1,039/Smoothed Out Slappy Hours" in 1991.

Crimpshrine: Crimpshrine was an American punk rock band from Berkeley, California.  The group was formed in 1982 by Aaron Cometbus, founder of the seminal punk rock zine "Cometbus", and future Operation Ivy vocalist Jesse Michaels.  They grew out of the East Bay scene, centered on 924 Gilman Street, and had an important influence on later East Bay bands such as Operation Ivy, Green Day and punk rock in general.

Jesse Michaels: Jesse Michaels is a songwriter, vocalist, guitarist and artist from Berkeley, California.  He is the son of the author Leonard Michaels and was married to producer Audrey Marrs.  His lyrics deal with politics, racism, and general social issues.  He is most well known as the vocalist for the ska punk band Operation Ivy.

1,039/Smoothed Out Slappy Hours: 1,039/Smoothed Out Slappy Hours is a collection of early recordings by American punk rock band Green Day, released on October 1, 1991 by Lookout Records.  Often referred to as the band's debut album, the compilation combines the band's actual debut "39/Smooth" and its first two extended plays "Slappy" and "1,000 Hours", which are all currently out of print.  The album included one cover, "Knowledge" (originally from the "Slappy" EP), which was originally by influential California punk band Operation Ivy, whose singer, Jesse Michaels, contributed the artwork for the album.  The cover art features the same image from "39/Smooth".

Big Rig (band): Big Rig was a punk band from the San Francisco Bay Area fronted by singer/songwriter Jesse Michaels.  Michaels performed with the group after the breakup of his previous project, Operation Ivy, and before forming the band Common Rider.

Supporting paragraphs: Jaren Johnston Jesse Michaels
Answer: Jesse Michaels