He recorded a
demo tape and gave it to
Biz Markie, who signed him to the label
Cold Chillin' Records in 1989. In 1990 he released his debut,
Smooth Assassin, which spawned two Rap Chart hits: "Something New" (#11) which sampled
James & Bobby Purify's "
I'm Your Puppet", and "Sugar Free" (#9). He became noted for his high-end tailored attire, always appearing in public wearing a suit and tie. Grand Daddy I.U. appeared as a guest on several hip hop albums in the
1990s, including
Big L's
Lifestylez ov da Poor & Dangerous and
Positive K's
The Skills Dat Pay da Bills. Grand Daddy I.U. did
ghostwriting and production work for Markie and
Roxanne Shanté but became disenchanted with Markie over a dispute involving publishing credits for the tracks on his debut. Grand Daddy I.U. continued to do production work in hip-hop for
Das EFX,
Heltah Skeltah,
KRS-One, and
Ice-T among others. He issued a third album,
Stick to the Script, in 2007, featuring production from
Large Professor and
Marco Polo and appearances from
2Pac, DV Alias Khryst, and Pudgee Tha Phat Bastard. In 2017 he reunited with long-time collaborator Pudgee Tha Phat Bastard on the album
Still Hear by Long Island emcee Lantz. The pair featured together on two songs, "Til The Casket" and "Yesterday". In 2020 I.U. released an album
The Essence, which featured artists
Method Man,
Lil Fame,
Sadat X,
Craig G,
Large Professor, and a host of other artists. The album was composed of songs all produced by I.U. and showcased his beat making talents. After a short break from releasing music, Grand Daddy I.U released a new single "Stay Fly" under Get@Em Recordz on July 2, 2021. ==Personal life and death==