James Scheffer, better known as Jim Jonsin, is an American producer from Palm Beach, Florida.
Producer of hip hop music hits such as "Whatever You Like" by T.I., "Cuddy Buddy" by Mike Jones, "Kiss Me Thru The Phone" by Soulja Boy Tell 'Em, 51st Rap Song of the Year "Lollipop" by Lil Wayne, "I Run" by Slim Thug. He is also the founder of his label Rebel Rock Entertainment.
He signed upstart Atlanta rapper B.o.B to his Rebel Rock label in 2008, known for his hit "Nothin on You" featuring Bruno Mars.
He is currently working on Jennifer Lopez new album for 2010. He also made a new hit song "Better Days" By The Game. He also co-wrote "How To Break A Heart" by the record-breaking Irish pop band Westlife for the band's album Where We Are.
He is currently signed to the management company Made Communication in Miami, FL.