Kelley is known for his work on James Bowen's Bob the Cat series and A Day in the Life of Marlon Bundo, a best-selling children's book written by Jill Twiss.
[4][1] He regards Albert Uderzo, Peter de Seve, Rien Poortvliet, Jon J. Muth, John Pike, Victor Ambrus, Lisbeth Zwerger, Brian Wildsmith and John Burningham as his artistic influences,[1] as well as television cartoons and animated movies.
[15][16] In March 2018, Kelley illustrated a children's book called A Day in the Life of Marlon Bundo under the pseudonym EG Keller.
[1][2][17] The book, written by Jill Twiss, is about a fictional day in the life of Marlon Bundo, the real-life pet rabbit of the Vice President of the United States, Mike Pence.
[18] A Day in the Life of Marlon Bundo was launched during an episode of the satirical talk show Last Week Tonight with John Oliver with the intent to mock Pence's staunch opposition to same-sex marriage.
[19] Rather than a straight-up parody of the Pences' book, A Day in the Life of Marlon Bundo is an actual children's story about marriage equality and democracy.