El-P

From Discogs:

Born March 4th, 1975 in Brooklyn, New York.EL-P, aka El Producto, is one of hip-hop's most obstinate and adventurous pioneers, combining a mid-'80s lo-fi old school aesthetic with a progressive rock musician's inclination to push boundaries. He has never succumbed to the whims of corporate hip-hop, instead choosing to pursue his own decidedly uncommercial leanings. In the mid-'90s, he developed a strong reputation with the groundbreaking trio Company Flow, a band whose achievements include the first LP, Funcrusher Plus, on Rawkus Records, a label that is considered by many the best label for intelligent hip-hop. Over the group's auspicious stint together, he proved he was himself capable of intense lyricism and sonic production so powerful it could stand on its own. In the latter part of the '90s, El-P was also a collaborator with Blackalicious, Mos Def, and Dilated Peoples. In 2001, after releasing one last album with Harlem rappers Cannibal OX, the group chose to amicably pursue their own directions. El-P has started his own label, Def Jux, and was also selected to work on former Rage Against the Machine frontman Zack de la Rocha's first solo album. Somehow he found the time to work on his own solo release during all of this, Fantastic Damage, which saw the light of day in May of 2002.

From Lastfm:

Born Jaime Meline, El-Producto or El-P is an underground hip-hop producer & rapper from New York City.

As a member of Company Flow, he honed his production skills alongside DJ Mr. Len and Bigg Jus. His unique style helped Company Flow gain critical, then popular success, culminating in 1997 with Funcrusher Plus. Eventual differences between the group & label Rawkus, lead to El-P & Len leaving the label in 2000.

El-P then decided to start his own record label, Definitive Jux. Of the many albums he has helped produce (most on Definitive Jux), the most influential and successful has been Cannibal Ox's only full-length album, The Cold Vein (2001). In 2002 he released his debut album, Fantastic Damage, which received critical acclaim. His follow-up, I'll Sleep When You're Dead, hit stores in March of 2007. It featured a wide range of artists, including The Mars Volta, Trent Reznor of Nine Inch Nails, and Cat Power. El-P has also contributed productions and guest raps to albums by DJ Krush, Aesop Rock, Murs, Cage, Mr. Lif, Prefuse 73, Del The Funky Homosapien, Mike Ladd, The High and Mighty, Aceyalone, and Alec Empire on the first Handsome Boy Modeling School album.

Cannibal Ox member Vordul Mega can be heard on "Linda Tripp", El-P's rebuttal to Sole's "Dear Elpee". He was also selected to work on Rage Against the Machine frontman Zach De La Rocha's solo album

From Wikipedia:

Jaime Meline, better known by his stage name El-P aka El-Producto (born on March 2, 1975), is an American hip hop artist and entrepreneur from Brooklyn, New York City. Originally a member of Company Flow, El-P has been a major driving force in alternative hip hop for over a decade. He is the co-founder, owner and CEO of the Definitive Jux record label. El-P is also a member of the Weathermen and art collective Cardboard City.