He emerged as a member of the hip hop group Geto Boys, which he formed in 1986 alongside fellow Houston rappers Bushwick Bill and Scarface.

He signed with the regionally-based label Rap-A-Lot Records to release his albums Controversy (1989) and I'm Goin' Out Lika Soldier (1992), the latter of which entered the Billboard 200.

[4] Considered the classic line up, Willie D, Bushwick Bill, and Scarface first emerged as the Geto Boys in 1989 with their gold record, Grip It!

He was featured on a track on Mike E. Clark's Extra Pop Emporium along with Insane Clown Posse and Twiztid called Scrubstitute Teachers.

On September 3, 1994, he married Bridget Bonier, who is a mechanical engineer, in a private ceremony on a yacht in Clear Lake City, Texas.

He won his first professional fight in 1992, knocking out Melle Mel at a charity boxing show by accident after the two bumped heads in the first round.

[6] In 1984 after turning 18, Dennis and Ronald Hope were arrested for holding up a gas station and were held for several months awaiting trial.

Dennis was arrested by FBI agents on May 13, 2009, on federal wire fraud charges, stemming from his purported sales of Apple iPhones through a company known as Texas One Wireless after luring potential buyers off Ebay (which he had used to build a reputation as a reliable seller); victims would pay for the electronics, after which all contact would cease and their products would fail to be delivered.

[10][11] This token was later found to be a fraud, resulting in first-ever criminal charges against financial services firms for market manipulation and “wash trading” in the cryptocurrency industry.