Ronald J. Spencer Jr., better known as Ronny J or Ronny J Listen Up, is an American producer, rapper, and DJ based in Miami, Florida. He has worked with Denzel Curry, Lil Pump, Smokepurpp, XXXTentacion, $ki Mask the Slump God, Rich Chigga, The Underachievers, Keith Ape, Pouya, Skrillex, and more. Some of Ronny's most notable songs include "Ultimate," "Threatz," "Audi," "I'm Sippin Tea in Yo Hood," "Gospel." "Phantom," "Fingers Blue," and "Smoke My Dope."

Ronny is originally for Southern New Jersey. He grew up listening to Church music with his family and would drum on the pots and pans that he found in the church. When he was 5-years-old, his parents would get him a drum set. It was not until middle school that Ronny began to listen to contemporary hip hop at the time including The Clipse, Lil Wayne, and Rick Ross. In high school, Ronny was in his school's marching band with future G.O.O.D. Music producer Charlie Heat who would inspire Ronny to start producing. Ronny would spend his time watching YouTube tutorials on how to produce with Reason (software). After spending a semester at Florida Memorial College, he transferred back to his home state to attend Camden County College.

Ronny would transfer again to the Art Institute of Miami where he met Denzel Curry. He would later drop out due to it's high tuition and was couch-surfing in strangers houses. Ronny considers this a difficult time in his life and had zero family in Florida to support him. The only reason why he stayed down there was because of music and working with Denzel.

Ronny briefly enrolled in Barry University via late registration, but barely went to class. Instead, he learned Logic Pro. One night, his anger inspired him to create a number of instrumentals and passed it along to Denzel's manager. One beat in particular became his first hit song "Threatz." Their follow up "Ultimate" would receive a co-sign from Chris Brown and got notcied by the wider music industry.

Ronny is a member of Denzel Curry’s Miami-based hip hop collective C9 and is currently signed to Atlantic Records.

On February 23rd, 2018, Ronny released his debut album OMGRONNY **.

Ronny describes his sound as unorthodox and going against the grain.

He tries to produce beats that are "hard as fuck, really gritty and dirty."

He is also inspired by EDM and enjoys patronizing raves.

Everything that Ronny makes is unique and he never copies something he has already made.