JE-Boy

Mads Johan Ellefson (born May 14, 1965), better known as JE-Boy, is a Norwegian DJ, music producer, and songwriter. He co-founded Second Beat Records and Heart Beat Studios.

In 2019, he was named Knight First Class of the by  for his services to Norwegian music and his international success.

Early life and career
Ellefson was born May 14, 1965 to Anton Otto Ellefson and Polish immigrant Monika Ellefson (née Jóźwiakowa). He began as a DJ in the late 1980s, and started producing remixed records and later original releases.

Personal life
On May 14, 2018, Ellefson was diagnosed with gallbladder cancer. He underwent alternative neoplasm treatment in and conventional treatments of chemotherapy and liver transplantation in. On January 17, 2019, Second Beat Records confirmed in a Twitter post that Ellefson was declared cancer-free. On August 1, 2020, FanGirls member Sammy Vue stated that Ellefson's cancer had relapsed in a interview with MTV Asia, which Ellefson confirmed in a Twitter post a few hours after the interview went public on May 2. Ellefson underwent a second liver transplant and two rounds of chemotherapy in Oslo in mid-August. He was declared cancer-free a second time on September 2, 2020.