Jeff Miyahara (born February 4, 1977) is a Japanese-Korean record producer and songwriter based in Tokyo, Japan. Beginning his career in the music industry in 1999, he has worked with many Japanese artists such as JUJU, Kana Nishino, Namie Amuro, TVXQ, Weather Girls, as well as international artists like Boyz II Men, Girls' Generation, and Timbaland. He has accrued many Oricon rated No. 1 Digital Download hits, including "Kimi No Subete Ni" by Spontania ft. JUJU and JASMINE's "sad to say". He was awarded several Gold Disc Awards by the Recording Industry Association of Japan in 2005, 2008, 2009, and was titled Nikkei Entertainment's "Hitmaker of the Year" in 2010. He has sold over 40 million units to date.